 | Angels Gilia | Gilia angelensis | Polemoniaceae | Phlox | Native, Common, Annual herb, typically blooms from February to April, Oak Woodland FebruaryMarchApril 201603 |
 | Annual Coreopsis | Leptosyne bigelovii | Asteraceae | Sunflower | Endemic, Common, Annual herb, typically blooms from February to June, Oak Woodland FebruaryMarchAprilMayJune 201707 |
 | Ashy Leaved Buckwheat | Eriogonum cinereum | Polygonaceae | Buckwheat | Native, Common, Shrub woody, typically blooms from June to October, coastal scrub and chaparral JuneJulyAugustSeptemberOctober 202207 |
 | Baby Blue Eyes | Nemophila menziesii | Boraginaceae | Borage | Native, Uncommon, Annual herb, typically blooms from February to June, shady canyon slopes, meadows FebruaryMarchAprilMayJune 201910 |
 | Basket Brush | Rhus aromatica | Anacardiaceae | Sumac | Native, , Shrub , typically blooms from February to April, chaparral, grassland FebruaryMarchApril 202406 |
 | Beach Evening Primrose | Camissoniopsis cheiranthifolia | Onagraceae | Evening Primrose | Native, Common, Perennial , typically blooms from March to July, Coastal Strand MarchAprilMayJuneJuly 201711 |
 | Bee Plant | Scrophularia californica | Scrophulariaceae | Figwort | Native, Uncommon, Perennial , typically blooms from April to July, sage, chaparral AprilMayJuneJuly 201902 |
 | Big Pod Ceanothus | Ceanothus megacarpus | Rhamnaceae | Buckthorn | Endemic, Common, Shrub or Tree , typically blooms from January to March, Chaparral JanuaryFebruaryMarch 202311 |
 | Bigberry Manzanita | Arctostaphylos glauca | Ericaceae | Heath | Native, Common, Shrub , typically blooms from December to March, woodland chapparal - northern slopes DecemberJanuaryFebruaryMarch 202304 |
 | Birds Beak | Cordylanthus rigidus | Orobanchaceae | Broomrape | Native, Common, Annual herb, typically blooms from May to August, open chaparral, coastal sage MayJuneJulyAugust 202201 |
 | Black Sage | Salvia mellifera | Lamiaceae | Mint | Native, Common, Shrub , typically blooms from April to July, Coastal Sage AprilMayJuneJuly 201611 |
 | Bladderpod | Peritome arborea | Cleomaceae | Spider Flower | Native, Common, Shrub , typically blooms from January to December, Coastal Bluffs, hillsides, oak woodlands JanuaryFebruaryMarchAprilMayJuneJulyAugustSeptemberOctoberNovemberDecemberAlways 200911 |
 | Blue Dicks | Dipterostemon capitatus | Themidaceae | Brodiaea | Native, Common, Perennial , typically blooms from December to May, Grasslands, Sage Scrub, open places in Chaparral DecemberJanuaryFebruaryMarch 200904 |
 | Blue Larkspur | Delphinium parryi | Ranunculaceae | Buttercup | Native, Common, Perennial , typically blooms from March to May, Grasslands, edges or open spaces of Chaparral and Oak Woodland MarchAprilMay 201107 |
 | Blue-Eyed Grass | Sisyrinchium bellum | Iridaceae | Iris | Native, Common, Perennial , typically blooms from March to June, Grasslands, Coastal Scrub or Woodlands MarchAprilMayJune 201004 |
 | Brodiaea | Brodiaea terrestris | Themidaceae | Brodiaea | Native, Uncommon, Perennial , typically blooms from May to June, clay soils, grassy meadows MayJune 202211 |
 | Buck Brush | Ceanothus cuneatus | Rhamnaceae | Buckthorn | Native, , Shrub or Tree woody, typically blooms from February to May, chaparral FebruaryMarchAprilMay 202405 |
 | Bush Mallow | Malacothamnus fasciculatus | Malvaceae | Mallow | Native, Common, Shrub , typically blooms from January to December, Chaparral, Coastal Sage Scrub, disturbed soil JanuaryFebruaryMarchAprilMayJuneJulyAugustSeptemberOctoberNovemberDecemberAlways 201010 |
 | Bush Poppy, Tree Poppy | Dendromecon rigida | Papaveraceae | Poppy | Native, Uncommon, Perennial , typically blooms from February to June, Chaparral FebruaryMarchAprilMayJune 201803 |
 | Bush Sunflower | Encelia californica | Asteraceae | Sunflower | Native, Common, Perennial , typically blooms from December to August, Chaparral and Coastal Sage Scrub DecemberJanuaryFebruaryMarch 201006 |
 | Calabazilla | Cucurbita foetidissima | Cucurbitaceae | Gourd | Native, Common, Perennial Vine , typically blooms from June to August, Sandy soil JuneJulyAugust 200707 |
 | California Aster | Corethrogyne filaginifolia | Asteraceae | Sunflower | Native, Common, Perennial , typically blooms from May to November, chaparral, sage scrub, grasslands, oak woodlands MayJuneJulyAugustSeptemberOctoberNovember 200711 |
 | California Brickellbush | Brickellia californica | Asteraceae | Sunflower | Native, Common, Perennial , typically blooms from July to November, open chaparral, coastal sage JulyAugustSeptemberOctoberNovember 202203 |
 | California Buckwheat | Eriogonum fasciculatum | Polygonaceae | Buckwheat | Native, Common, Perennial , typically blooms from January to December, Chaparral, Coastal Sage Scrub, Desert Scrub JanuaryFebruaryMarchAprilMayJuneJulyAugustSeptemberOctoberNovemberDecemberAlways 200708 |
 | California Buttercup | Ranunculus californicus | Ranunculaceae | Buttercup | Endemic, Uncommon, Perennial , typically blooms from February to May, Chaparral, Oak Woodland FebruaryMarchAprilMay 201712 |
 | California Coffeeberry | Frangula californica | Rhamnaceae | Buckthorn | Native, Common, Shrub , typically blooms from May to July, Chaparral and coastal sage scrub MayJuneJuly 202112 |
 | California Dodder | Cuscuta californica | Convolvulaceae | Morning Glory | Native, Common, Annual Vine herb, typically blooms from April to October, Chaparral AprilMayJuneJulyAugustSeptemberOctober 202107 |
 | California Everlasting | Pseudognaphalium californicum | Asteraceae | Sunflower | Native, Common, Perennial , typically blooms from January to July, sage scrub JanuaryFebruaryMarchAprilMayJuneJuly 202007 |
 | California Fuchsia | Epilobium canum | Onagraceae | Evening Primrose | Native, Common, Perennial , typically blooms from June to December, dry and/or rocky areas on slopes and in sage scrub JuneJulyAugustSeptemberOctoberNovemberDecember 200909 |
 | California Goldenrod | Solidago velutina | Asteraceae | Sunflower | Native, Common, Perennial , typically blooms from July to November, coastal sage scrub, chaparral, oak woodlands JulyAugustSeptemberOctoberNovember 202209 |
 | California Goldfields | Lasthenia californica | Asteraceae | Sunflower | Endemic, Common, Annual herb, typically blooms from March to May, meadows, hillsides MarchAprilMay 201605 |
 | California Laurel | Umbellularia californica | Lauraceae | Laurel | Native, Common, Shrub or Tree , typically blooms from November to March, riparian NovemberDecemberJanuaryFebruaryMarchAprilMayJuneJulyAugust 202108 |
 | California Milkweed | Asclepias californica | Apocynaceae | Dogbane | Native, Common, Perennial , typically blooms from April to June, chaparral, open slopes AprilMayJune 201911 |
 | California Plantain | Plantago erecta | Plantaginaceae | Plantain | Native, Common , Annual herb, typically blooms from March to April, Coastal Scrub, Open Areas MarchApril 201908 |
 | California Poppy | Eschscholzia californica | Papaveraceae | Poppy | Endemic, Common, Annual herb, typically blooms from February to September, meadows, coastal sage scrub, sandy riparian areas FebruaryMarchAprilMayJuneJulyAugustSeptember 201212 |
 | California Saxifrage | Micranthes californica | Saxifragaceae | Saxifrage | Endemic, Uncommon, Perennial , typically blooms from February to April, Coastal Sage FebruaryMarchApril 201704 |
 | California Thistle | Cirsium occidentale v californicum | Asteraceae | Sunflower | Endemic, Common, Perennial , typically blooms from April to August, Chaparral, Woodlands, Coastal Sage Scrub AprilMayJuneJulyAugust 201007 |
 | California Walnut | Juglans californica | Juglandaceae | Walnut | Endemic, Common, Shrub or Tree , typically blooms from February to April, Oak Woodland FebruaryMarchApril 202105 |
 | Canchalagua | Zeltnera venusta | Gentianaceae | Gentian | Native, Uncommon, Annual herb, typically blooms from May to August, open chaparral, coastal sage MayJuneJulyAugust 202110 |
 | Canyon Dodder | Cuscuta subinclusa | Convolvulaceae | Morning Glory | Native, Common, Perennial Vine , typically blooms from March to October, Chaparral MarchAprilMayJuneJulyAugustSeptemberOctober 202106 |
 | Canyon Sunflower | Venegasia carpesioides | Asteraceae | Sunflower | Native, Common, Shrub , typically blooms from December to July, shady places in Oak Woodland, Sage Scrub and Chaparral DecemberJanuaryFebruaryMarch 201206 |
 | Castor Bean | Ricinis communis | Euphorbiaceae | Spurge | Invasive, Common, Shrub , typically blooms from January to December, Streambeds, roadsides, disturbed soil; JanuaryFebruaryMarchAprilMayJuneJulyAugustSeptemberOctoberNovemberDecemberAlways 200901 |
 | Catalina Mariposa Lily | Calochortus catalinae | Liliaceae | Lily | Endemic, , Perennial , typically blooms from March to June, coastal, woodlands, chaparral MarchAprilMayJune 202408 |
 | Ceanothus | Ceanothus Species | Rhamnaceae | Buckthorn | Native, Common, Shrub , typically blooms from November to March, Chaparral, ridges, slopes, woodland, coastal scrub NovemberDecemberJanuaryFebruaryMarchAprilMayJuneJulyAugust 200603 |
 | Chalk Live-Forever | Dudleya pulverulenta | Crassulaceae | Stonecrop | Native, Common, Perennial , typically blooms from June to August, Rocky cliffsides in chaparral and coastal sage scrub JuneJulyAugust 200907 |
 | Chamise | Adenostoma fasciculatum | Rosaceae | Rose | Native, Common, Shrub , typically blooms from February to September, dry slopes in Chaparral and Sage Scrub FebruaryMarchAprilMayJuneJulyAugustSeptember 201207 |
 | Chaparral Currant | Ribes malvaceum | Grossulariaceae | Gooseberry | Native, Common, Perennial , typically blooms from December to April, Oak Woodland DecemberJanuaryFebruaryMarch 201502 |
 | Chaparral Honeysuckle | Lonicera subspicata | Caprifoliaceae | Honeysuckle | Endemic, Common, Shrub , typically blooms from April to August, Chaparral AprilMayJuneJulyAugust 202111 |
 | Checker Bloom | Sidalcea sparsifolia | Malvaceae | Mallow | Native, Uncommon, Perennial , typically blooms from March to July, Coastal Sage MarchAprilMayJuneJuly 201710 |
 | Chia, Golden Chia | Salvia columbariae | Lamiaceae | Mint | Native, Common, Annual herb, typically blooms from March to June, Coastal Sage, Chaparral MarchAprilMayJune 201612 |
 | Chinese Houses | Colinsia heterophylla | Plantaginaceae | Plantain | Native, Uncommon, Annual herb, typically blooms from February to May, Oak Woodland FebruaryMarchAprilMay 201506 |
 | Chocolate Lily | Fritillaria biflora | Liliaceae | Lily | Endemic, Uncommon, Perennial , typically blooms from January to March, Heavy clay soil JanuaryFebruaryMarch 201002 |
 | Cliff Aster | Malacothrix saxatilis | Asteraceae | Sunflower | Native, Common, Perennial , typically blooms from January to December, coastal sage/or chaparral JanuaryFebruaryMarchAprilMayJuneJulyAugustSeptemberOctoberNovemberDecemberAlways 201409 |
 | Coast Cholla | Cylindropuntia prolifera | Cactaceae | Cactus | Native, Common, Shrub , typically blooms from April to June, dry slopes and grasslands at low elevations near the coast or in Sage Scrub AprilMayJune 201201 |
 | Coastal Live Oak | Quercus agrifolia | Fagaceae | Beech | Native, Common, Tree , typically blooms from February to May, open woodlands FebruaryMarchAprilMay 202306 |
 | Cobweb Thistle | Cirsium occidentale | Asteraceae | Sunflower | Native, Uncommon, Perennial , typically blooms from March to July, Coastal sage MarchAprilMayJuneJuly 202008 |
 | Coffee Fern | Pellaea andromedifolia | Pteridaceae | Brake | Native, Common, Perennial , typically blooms from January to April, Chaparral and coastal sage scrub JanuaryFebruaryMarchApril 202206 |
 | Collarless Poppy | Eschscholzia caespitosa | Papaveraceae | Poppy | Native, Common, Annual herb, typically blooms from March to July, Coastal Sage MarchAprilMayJuneJuly 202011 |
 | Common Fiddleneck | Amsinckia intermedia | Boraginaceae | Borage | Native, Common, Annual herb, typically blooms from February to May, grassy hillsides, burned areas FebruaryMarchAprilMay 201301 |
 | Common Sunflower | Helianthus annus | Asteraceae | Sunflower | Native, Common, Annual herb, typically blooms from January to December, fields, roadsides and trailsides JanuaryFebruaryMarchAprilMayJuneJulyAugustSeptemberOctoberNovemberDecemberAlways 201309 |
 | Common Vervain | Verbena lasiostachys | Verbenaceae | Vervain | Native, Common, Perennial , typically blooms from December to August, open areas, dry or moist DecemberJanuaryFebruaryMarch 201009 |
 | Common Yarrow | Achillea millefolium | Asteraceae | Sunflower | Native, Common, Perennial , typically blooms from March to June, Chaparral MarchAprilMayJune 201807 |
 | Cottonwood | Populus fremontii | Salicaceae | Willow | Native, Common, Tree , typically blooms from January to March, lower streambeds in riparian woodlands JanuaryFebruaryMarch 200811 |
 | Coyote Brush | Baccharis pilularis | Asteraceae | Sunflower | Native, Common, Perennial , typically blooms from May to December, Sage Scrub, Oak Woodland, Chaparral and Grassland MayJuneJulyAugustSeptemberOctoberNovemberDecember 200910 |
 | Cream Cups | Platystemon californicus | Papaveraceae | Poppy | Native, Uncommon, Annual herb, typically blooms from March to May, Open areas MarchAprilMay 202005 |
 | Creek Monkey Flower | Erythranthe guttata | Phrymaceae | Lopseed | Native, Common, Annual herb, typically blooms from March to July, creeks, damp areas MarchAprilMayJuneJuly 202004 |
 | Crimson Pitcher Sage | Salvia spathacea | Lamiaceae | Mint | Native, Common, Perennial , typically blooms from February to June, Lightly-shaded areas - Chaparral, Coastal Scrub FebruaryMarchAprilMayJune 201003 |
 | Datura | Datura species | Solanaceae | Nightshade | Native, Common, Annual herb, typically blooms from March to November, full sun - roadsides, sandy or gravel MarchAprilMayJuneJulyAugustSeptemberOctoberNovember 200809 |
 | Deerweed | Acmispon glaber | Fabaceae | Legume | Native, Common, Perennial , typically blooms from January to August, Chaparral JanuaryFebruaryMarchAprilMayJuneJulyAugust 201011 |
 | Douglas Nightshade | Solanum douglasii | Solanaceae | Nightshade | Native, Common, Perennial , typically blooms from February to October, Shady hillsides, canyons, coastal scrubland FebruaryMarchAprilMayJuneJulyAugustSeptemberOctober 202006 |
 | Downy Monkey Flower | Erythranthe pilosus | Phrymaceae | Lopseed | Native, Common, Annual herb, typically blooms from April to August, riparian AprilMayJuneJulyAugust 202012 |
 | Eastwood Manzanita | Arctostaphylos glandulosa | Ericaceae | Heath | Native, Common, Shrub , typically blooms from November to February, Chaparral, rocky slopes and ridges NovemberDecemberJanuaryFebruaryMarchAprilMayJuneJulyAugustSeptember 200801 |
 | Elderberry | Sambucus nigra subsp. caerulea | Adoxaceae | Muskroot | Native, Common, Tree , typically blooms from April to August, woodlands, open areas and chaparral AprilMayJuneJulyAugust 200808 |
 | Elegant Clarkia | Clarkia unguiculata | Onagraceae | Evening Primrose | Native, Common, Annual herb, typically blooms from April to July, Sun or shade in grasslands, woodlands, and chaparral AprilMayJuneJuly 200906 |
 | Eucrypta | Eucrypta chrysanthemifolia | Boraginaceae | Waterleaf | Native, Common, Annual herb, typically blooms from January to June, woodland, sage scrub, chaparral JanuaryFebruaryMarchAprilMayJune 200802 |
 | Farewell-to-Spring | Clarkia bottae | Onagraceae | Evening Primrose | Native, Common, Annual herb, typically blooms from April to July, Coastal Sage, open slopes AprilMayJuneJuly 202009 |
 | Fern-Leaf Phacelia | Phacelia distans | Boraginaceae | Borage | Native, Common, Annual herb, typically blooms from March to June, dry slopes in Oak Woodland and Coastal Sage MarchAprilMayJune 201303 |
 | Fiesta Flower | Pholistoma auritum | Boraginaceae | Waterleaf | Native, Common, Annual herb, typically blooms from March to May, shady areas, common throughout most plant communities MarchAprilMay 201105 |
 | Fire Heart, Bleeding Heart | Ehrendorferia ochroleuca | Papaveraceae | Poppy | Native, Uncommon, Perennial , typically blooms from April to December, Chaparral, Oak Woodland AprilMayJuneJulyAugustSeptemberOctoberNovemberDecember 201408 |
 | Fire Poppy | Papaver californicum | Papaveraceae | Poppy | Endemic, Uncommon, Annual herb, typically blooms from April to July, Chaparral AprilMayJuneJuly 201804 |
 | Flowering Ash | Fraxinus dipetala | Oleaceae | Olive | Native, , Shrub or Tree , typically blooms from March to May, Woodland, Chaparral MarchAprilMay 202409 |
 | Foothill Penstemon | Penstemon heterophyllus | Plantaginaceae | Plantain | Endemic, Uncommon, Perennial , typically blooms from April to July, dry hillsides in Oak Woodland and Chaparral AprilMayJuneJuly 201205 |
 | Fringed Indian Pink | Silene laciniata | Caryophyllaceae | Pink | Native, Common, Perennial , typically blooms from April to July, shaded woodlands, sage scrub, chaparral AprilMayJuneJuly 200806 |
 | Fringed Linanthus | Linanthus dianthiflorus | Polemoniaceae | Phlox | Native, Uncommon, Annual herb, typically blooms from January to March, Coastal Sage, Chaparral JanuaryFebruaryMarch 201509 |
 | Fuchsia-Flowered Gooseberry | Ribes speciosum | Grossulariaceae | Gooseberry | Native, Common, Shrub , typically blooms from January to May, shaded canyons in Sage Scrub and Chaparral JanuaryFebruaryMarchAprilMay 201304 |
 | Giant Coreopsis | Coreopsis gigantea | Asteraceae | Sunflower | Endemic, Common, Perennial , typically blooms from November to June, Coastal areas, especially where fog is common NovemberDecemberJanuaryFebruaryMarchAprilMay 200903 |
 | Globe Gilia | Gilia capitata | Polemoniaceae | Phlox | Native, Uncommon, Annual herb, typically blooms from March to June, Chaparral MarchAprilMayJune 201511 |
 | Globe Lily | Calochortus albus | Liliaceae | Lily | Native, Uncommon, Perennial , typically blooms from April to June, Oak Woodland AprilMayJune 201601 |
 | Golden Currant | Ribes aureum | Grossulariaceae | Gooseberry | Native, Common, Shrub , typically blooms from January to March, stream beds, meadows JanuaryFebruaryMarch 202301 |
 | Golden Star | Bloomeria crocea | Themidaceae | Brodiaea | Native, Common, Perennial , typically blooms from April to June, Coastal Sage, Chaparral AprilMayJune 201507 |
 | Golden Yarrow | Eriophyllum confertiflorum | Asteraceae | Sunflower | Native, Common, Shrub , typically blooms from December to July, open places, dry slopes in Chaparral and Sage Scrub, rocky places at the base of cliffs DecemberJanuaryFebruaryMarch 201209 |
 | Greenbark Ceanothus | Ceanothus spinosus | Rhamnaceae | Buckthorn | Native, Common, Shrub or Tree , typically blooms from February to April, Chaparral FebruaryMarchApril 202312 |
 | Gum Plant | Grindelia camporum | Asteraceae | Sunflower | Native, Common, Perennial , typically blooms from May to September, open chaparral, coastal sage MayJuneJulyAugustSeptember 202205 |
 | Hairy Leaved Ceanothus | Ceanothus oliganthus | Rhamnaceae | Buckthorn | Endemic, Common, Shrub or Tree , typically blooms from February to April, chaparral FebruaryMarchApril 202402 |
 | Heart Leaved Penstemon | Keckiella cordifolia | Plantaginaceae | Plantain | Native, Common, Perennial , typically blooms from March to August, Coastal Sage, Oak Woodlands MarchAprilMayJuneJulyAugust 201705 |
 | Hedge Nettle | Stachys bullata | Lamiaceae | Mint | Native, Common, Perennial , typically blooms from February to July, Chaparral, Woodlands, Sage Scrub FebruaryMarchAprilMayJuneJuly 201008 |
 | Hillside Gooseberry | Ribes californicum | Grossulariaceae | Gooseberry | Endemic, Common, Shrub , typically blooms from January to March, woodland chapparal - northern slopes JanuaryFebruaryMarch 202303 |
 | Hoary Leaved Ceanothus | Ceanothus crassifolius | Rhamnaceae | Buckthorn | Native, Common, Shrub or Tree , typically blooms from February to April, Chaparral FebruaryMarchApril 202401 |
 | Holly Leaf Red Berry | Rhamnus ilicifolia | Rhamnaceae | Buckthorn | Native, Common, Shrub , typically blooms from February to April, coastal sage and chaparral FebruaryMarchApril 202307 |
 | Holly-Leaved Cherry | Prunus ilicifolia | Rosaceae | Rose | Native, Common, Perennial Shrub , typically blooms from November to June, Chaparral, canyons, moist and/or north-facing NovemberDecemberJanuaryFebruaryMarchAprilMay 200810 |
 | Humboldt Lily | Lilium humboldtii | Liliaceae | Lily | Native, Uncommon, Perennial , typically blooms from May to July, Chaparral and Oak Woodland, near streams MayJuneJuly 201106 |
 | Indian Paintbrush | Castilleja affinis | Orobanchaceae | Broomrape | Native, Common, Perennial , typically blooms from February to May, Coastal Sage Scrub, Grassland, Chaparral FebruaryMarchAprilMay 201109 |
 | Indian Warrior | Pedicularis densiflora | Orobanchaceae | Broomrape | Native, Uncommon, Perennial , typically blooms from February to April, Chaparral FebruaryMarchApril 201101 |
 | Johnny-jump-up | Viola pedunculata | Violaceae | Violet | Native, Uncommon, Perennial , typically blooms from January to May, open grassy areas in woodlands, chaparral, sage scrub JanuaryFebruaryMarchAprilMay 201202 |
 | Large-Flowered Phacelia | Phacelia grandiflora | Boraginaceae | Borage | Native, Common, Annual herb, typically blooms from January to June, woodlands, chaparral, coastal sage scrub JanuaryFebruaryMarchAprilMayJune 200703 |
 | Leather Root | Hoita macrostachya | Fabaceae | Legume | Native, Uncommon, Perennial , typically blooms from June to September, Chaparral, wetland riparian JuneJulyAugustSeptember 201802 |
 | Lemonade Berry | Rhus integrifolia | Anacardiaceae | Sumac | Native, Common, Shrub Tree , typically blooms from December to May, Chaparral, North Side DecemberJanuaryFebruaryMarch 200608 |
 | Lupine | Lupinus Species | Fabaceae | Legume | Native, Common, Annual Perennial , typically blooms from February to June, Chaparral, ridges, slopes, canyons, coastal scrub FebruaryMarchAprilMayJune 200604 |
 | Lyons Pentachaeta | Pentachaeta lyonii | Asteraceae | Sunflower | Endemic, Rare, Annual herb, typically blooms from May to August, Coastal Sage MayJuneJulyAugust 201608 |
 | Mariposa Lily | Calochortus species | Liliaceae | Lily | Endemic, Common, Perennial , typically blooms from February to June, grasslands, slopes, chaparral FebruaryMarchAprilMayJune 200805 |
 | Matilija Poppy | Romneya coulteri | Papaveraceae | Poppy | Endemic, Uncommon, Perennial , typically blooms from April to June, Coastal Sage Scrub AprilMayJune 201801 |
 | Milkmaids | Cardamine californica | Brassicaceae | Mustard | Native, Uncommon, Perennial , typically blooms from January to March, Shady, moist hillsides or stream banks in riparian areas JanuaryFebruaryMarch 200902 |
 | Milkwort | Polygala cornuta | Polygalacea | Milkwort | Native, Uncommon, Shrub , typically blooms from May to July, Riparian, Chaparral MayJuneJuly 202404 |
 | Miners Lettuce | Claytonia perfoliata | Portulacaceae | Purslane | Native, Common, Annual herb, typically blooms from January to May, shady areas in chaparral, woodland, sage scrub JanuaryFebruaryMarchAprilMay 200804 |
 | Morning Glory | Calystegia macrostegia | Convolvulaceae | Morning Glory | Native, Common, Perennial or Vine , typically blooms from March to August, Sage Scrub, Chaparral MarchAprilMayJuneJulyAugust 201307 |
 | Mountain Mahogany | Cercocarpus betuloides | Rosaceae | Rose | Native, Common, Shrub , typically blooms from February to May, Chaparral FebruaryMarchAprilMay 201907 |
 | Mugwort | Artemisia douglasiana | Asteraceae | Sunflower | Native, Common, Perennial , typically blooms from July to November, Riparian Woodlands JulyAugustSeptemberOctoberNovember 201210 |
 | Mule Fat | Baccharis salicifolia | Asteraceae | Sunflower | Native, Common, Shrub , typically blooms from January to December, Riparian JanuaryFebruaryMarchAprilMayJuneJulyAugustSeptemberOctoberNovemberDecemberAlways 201110 |
 | Mustard Evening Primrose | Eulobus californicus | Onagraceae | Evening Primrose | Native, Common, Annual herb, typically blooms from March to May, Grassland, Chaparral, Coastal Sage Scrub, dry slopes MarchAprilMay 201104 |
 | Narrow Leaved Milkweed | Asclepias fascicularis | Apocynaceae | Dogbane | Endemic, Common, Perennial , typically blooms from May to September, Grasslands MayJuneJulyAugustSeptember 201701 |
 | Notable Penstemon | Penstemon spectabilis | Plantaginaceae | Plantain | Native, Common, Perennial , typically blooms from April to June, Sage Chaparral AprilMayJune 201808 |
 | Owl’s Clover | Castilleja exserta | Orobanchaceae | Broomrape | Native, Common, Annual herb, typically blooms from January to June, Grasslands and Coastal Sage Scrub JanuaryFebruaryMarchAprilMayJune 201204 |
 | Parry’s Phacelia | Phacelia parryi | Boraginaceae | Borage | Native, Common, Annual herb, typically blooms from March to May, Chaparral, Coastal Sage Scrub MarchAprilMay 201103 |
 | Peak Rush Rose | Crocanthemum scoparium | Cistaceae | Rock Rose | Native, Common, Shrub , typically blooms from March to July, Chaparral and coastal sage scrub MarchAprilMayJuneJuly 202204 |
 | Peninsular Onion | Allium peninsulare | Alliaceae | Onion | Native, Uncommon, Perennial , typically blooms from April to May, Coastal Sage AprilMay 201708 |
 | Perezia, Sacapellote | Acourtia microcephala | Asteraceae | Sunflower | Native, Common, Perennial , typically blooms from May to July, Woodland and or Chaparral MayJuneJuly 201407 |
 | Pin Cushion | Chaenactis artemisiifolia | Asteraceae | Sunflower | Native, Common, Annual herb, typically blooms from March to June, coastal scrub and chaparral MarchAprilMayJune 202210 |
 | Pitcher Sage | Lepechinia fragrans | Lamiaceae | Mint | Native, Common, Shrub , typically blooms from April to July, Chaparral AprilMayJuneJuly 201805 |
 | Poison Oak | Toxicodendron diversilobum | Anacardiaceae | Sumac | Native, Common, Perennial Vine , typically blooms from February to June, oak woodland FebruaryMarchAprilMayJune 200612 |
 | Prickly Pear | Opuntia oricola | Cactaceae | Cactus | Native, Common, Perennial , typically blooms from May to August, low elevation chaparral and coastal sage scrub MayJuneJulyAugust 200908 |
 | Prickly Phlox | Linanthus californicus | Polemoniaceae | Phlox | Native, Common, Perennial , typically blooms from March to June, Chaparral MarchAprilMayJune 201510 |
 | Prickly Popcorn Flower | Cryptantha muricata | Boraginaceae | Borage | Native, Common, Annual herb, typically blooms from January to June, open areas on rocky slopes JanuaryFebruaryMarchAprilMayJune 201203 |
 | Prickly Poppy | Argemone munita | Papaveraceae | Poppy | Native, Uncommon, Perennial Annual , typically blooms from April to July, dry, sandy soil or gravel AprilMayJuneJuly 200705 |
 | Purple Nightshade | Solanum xanti | Solanaceae | Nightshade | Native, Common, Shrub , typically blooms from December to June, Sage, chapparal DecemberJanuaryFebruaryMarch 200601 |
 | Purple Sage | Salvia leucophylla | Lamiaceae | Mint | Native, Common, Shrub , typically blooms from February to August, Coastal Sage FebruaryMarchAprilMayJuneJulyAugust 201610 |
 | Rattlesnake Weed | Euphorbia albomarginata | Euphorbiaceae | Spurge | Native, Common, Perennial , typically blooms from April to November, dry slopes and fields AprilMayJuneJulyAugustSeptemberOctoberNovember 201211 |
 | Red Maids | Calandrinia menziesii | Portulacaceae | Purslane | Native, Uncommon, Annual herb, typically blooms from February to June, grassy areas and woodland edges FebruaryMarchAprilMayJune 201311 |
 | Red Shank | Adenostoma sparsifolium | Rosaceae | Rose | Native, Uncommon, Shrub or Tree , typically blooms from June to September, dry slopes in rain shadow of coastal slopes JuneJulyAugustSeptember 201111 |
 | Red Skinned Onion | Allium haematochiton | Alliaceae | Onion | Native, Common, Perennial , typically blooms from March to May, hillsides near water MarchAprilMay 201310 |
 | Red-Stem Filaree | Erodium cicutarium | Geraniaceae | Geranium | Invasive, Common, Annual herb, typically blooms from November to June, open or grassy areas in dry, disturbed and/or sand NovemberDecemberJanuaryFebruaryMarchAprilMay 200912 |
 | Rock Daisy | Perityle emoryi | Asteraceae | Sunflower | Native, Uncommon, Annual herb, typically blooms from March to October, Coastal Sage MarchAprilMayJuneJulyAugustSeptemberOctober 201505 |
 | Rose Snapdragon | Antirrhinum multiflorum | Plantaginaceae | Plantain | Endemic, Uncommon, Annual herb, typically blooms from May to July, Chaparal MayJuneJuly 201901 |
 | Royal Goldfields | Lasthenia coronaria | Asteraceae | Sunflower | Native, Uncommon, Annual herb, typically blooms from March to May, open areas, hillsides MarchAprilMay 201607 |
 | Sagebrush | Artemisia californica | Asteraceae | Sunflower | Native, Common, Perennial , typically blooms from September to December, Coastal Sage SeptemberOctoberNovemberDecember 201811 |
 | San Diego Milk-aster | Stephanomeria diegensis | Asteraceae | Sunflower | Native, Common, Annual herb, typically blooms from July to December, Chaparral, Coastal Scrub JulyAugustSeptemberOctoberNovemberDecember 201406 |
 | Sand Verbena | Abronia maritima | Nyctaginaceae | Four O'Clock | Native, Common, Perennial , typically blooms from February to October, coastal dunes FebruaryMarchAprilMayJuneJulyAugustSeptemberOctober 202102 |
 | Sawtooth Goldenbush | Hazardia squarrosa | Asteraceae | Sunflower | Native, Common, Perennial , typically blooms from June to October, Chaparral, Coastal Sage Scrub JuneJulyAugustSeptemberOctober 202104 |
 | Scale Broom | Lepidospartum squamatum | Asteraceae | Sunflower | Native, Common, Perennial , typically blooms from August to November, Chaparral, Coastal Sage Scrub AugustSeptemberOctoberNovember 202103 |
 | Scarlet Bugler | Penstemon centranthifolius | Plantaginaceae | Plantain | Native, Common, Perennial , typically blooms from February to June, Sage Chaparral Oak Woodland FebruaryMarchAprilMayJune 201809 |
 | Scarlet Larkspur | Delphinium cardinale | Ranunculaceae | Buttercup | Native, Common, Perennial , typically blooms from May to August, chaparral and sage scrub MayJuneJulyAugust 200807 |
 | Scarlet Monkey Flower | Erythranthe cardinalis | Phrymaceae | Lopseed | Native, Common, Perennial , typically blooms from May to September, wet areas along creeks, seeps MayJuneJulyAugustSeptember 202002 |
 | Scrub Oak | Quercus berberidifolia | Fagaceae | Beech | Native, Common, Shrub or Tree , typically blooms from March to May, Coastal Sage MarchAprilMay 202308 |
 | Shooting Star | Primula clevelandii | Primulaceae | Primrose | Native, Common, Perennial , typically blooms from December to March, Open grassy areas DecemberJanuaryFebruaryMarch 200803 |
 | Silk Tassel Bush | Garrya veatchii | Garryaceae | Silk Tassel | Native, uncommon, Shrub or Tree , typically blooms from November to January, chaparral NovemberDecemberJanuaryFebruaryMarchAprilMayJuneJulyAugustSeptemberOctoberAlways 202407 |
 | Skull Caps | Scutellaria tuberosa | Lamiaceae | Mint | Native, Uncommon, Perennial , typically blooms from February to May, Chaparral FebruaryMarchAprilMay 201812 |
 | Slender Sunflower | Helianthus gracilentus | Asteraceae | Sunflower | Native, Common, Perennial , typically blooms from May to October, Chaparral, fields, dry slopes, roadsides MayJuneJulyAugustSeptemberOctober 201308 |
 | Slender Tarweed | Deinandra fasciculata | Asteraceae | Sunflower | Native, Common, Annual herb, typically blooms from May to August, Grasslands, Chaparral MayJuneJulyAugust 201806 |
 | Slimy Monkey Flower | Erythranthe floribunda | Phrymaceae | Lopseed | Native, Common, Annual herb, typically blooms from May to September, Riparian MayJuneJulyAugustSeptember 202101 |
 | Snowberry | Symphoricarpos mollis | Caprifoliaceae | Honeysuckle | Native, Common, Perennial , typically blooms from March to May, Chaparral MarchAprilMay 202109 |
 | Soap Plant | Chlorogalum pomeridianum | Agavaceae | Agave | Native, Common, Perennial , typically blooms from May to June, coastal sage, dry grassland MayJune 201410 |
 | Southern Tauschia | Tauschia arguta | Apiaceae | Carrot | Native, Common, Perennial , typically blooms from February to June, dry slopes in Sage Scrub, Woodlands and Chaparral FebruaryMarchAprilMayJune 201302 |
 | Speckled Clarkia | Clarkia cylindrica | Onagraceae | Evening Primrose | Native, Common, Annual herb, typically blooms from April to July, Chaparral, slopes, coastal sage, woodlands, grassl AprilMayJuneJuly 200706 |
 | Star Lily | Toxicoscordion fremontii | Melanthiaceae | Deathcamasus | Native, Uncommon, Perennial , typically blooms from February to June, Coastal Sage FebruaryMarchAprilMayJune 201504 |
 | Stick Leaf, San Luis Blazingstar | Mentzelia micrantha | Loasaceae | Loasaceae | Native, Uncommon, Annual herb, typically blooms from March to June, Coastal Sage MarchAprilMayJune 201604 |
 | Sticky Cinquefoil | Drymocallis glandulosa | Rosaceae | Rose | Native, Uncommon, Perennial , typically blooms from April to July, Oak Woodland AprilMayJuneJuly 201411 |
 | Sticky Gilia, Stinky Gilia | Allophylum glutinosum | Polemoniaceae | Phlox | Native, Uncommon, Annual herb, typically blooms from February to August, Coastal Sage FebruaryMarchAprilMayJuneJulyAugust 201602 |
 | Sticky Monkey Flower | Diplacus longiflorus | Phrymaceae | Lopseed | Native, Common, Perennial , typically blooms from March to August, Chaparral MarchAprilMayJuneJulyAugust 202001 |
 | Sticky Phacelia | Phacelia viscida | Boraginaceae | Borage | Native, Uncommon, Annual , typically blooms from March to June, Coastal sage scrub and chaparral MarchAprilMayJune 202309 |
 | Stream Orchid | Epipactis gigantea | Orchidaceae | Orchid | Native, Uncommon, Perennial , typically blooms from April to July, Riparian AprilMayJuneJuly 201512 |
 | Sugar Bush | Rhus ovata | Anacardiaceae | Sumac | Native, Common, Shrub , typically blooms from March to June, Chaparral - South facing slopes MarchAprilMayJune 201606 |
 | Sumac | Malosma laurina | Anacardiaceae | Sumac | Native, Common, Perennial , typically blooms from June to August, Chaparral JuneJulyAugust 201112 |
 | Sycamore | Platanus racemosa | Platanaceae | Sycamore | Native, Common, Tree , typically blooms from February to April, stream beds FebruaryMarchApril 200611 |
 | Tejon Milk-Aster | Stephanomeria cichoriacea | Asteraceae | Sunflower | Native, Common, Perennial , typically blooms from July to October, Chaparral, Coastal Sage JulyAugustSeptemberOctober 201501 |
 | Telegraph Weed | Heterotheca grandiflora | Asteraceae | Sunflower | Native, Common, Annual herb, typically blooms from January to December, sand, disturbed soils JanuaryFebruaryMarchAprilMayJuneJulyAugustSeptemberOctoberNovemberDecemberAlways 201905 |
 | Tidy Tips | Layia platyglossa | Asteraceae | Sunflower | Native, Uncommon, Annual , typically blooms from March to June, grasslands MarchAprilMayJune 202403 |
 | Toyon | Heteromeles arbutifolia | Rosaceae | Rose | Native, Common, Shrub Tree , typically blooms from May to July, Chaparral, ridges, slopes, woodland, coastal scrub MayJuneJuly 200512 |
 | Tree Tobacco | Nicotiana glauca | Solanaceae | Nightshade | Invasive, Common, Shrub Tree , typically blooms from January to December, streambeds and disturbed soils JanuaryFebruaryMarchAprilMayJuneJulyAugustSeptemberOctoberNovemberDecemberAlways 200701 |
 | Turkey Mullein | Croton setiger | Euphorbiaceae | Spurge | Native, Common, Annual herb, typically blooms from April to November, Common in open, sandy disturbed places AprilMayJuneJulyAugustSeptemberOctoberNovember 200710 |
 | Turkish Rugging | Chorizanthe staticoides | Polygonaceae | Buckwheat | Native, Common, Annual herb, typically blooms from April to July, grassy slopes, dry and sandy places in Chaparral AprilMayJuneJuly 201306 |
 | Twining Snapdragon | Antirrhinum kelloggii | Plantaginaceae | Plantain | Native, Common, Annual or Vine herb, typically blooms from January to May, Coastal Sage Scrub and dry areas in the Chaparral JanuaryFebruaryMarchAprilMay 200905 |
 | Two Tone Everlasting | Pseudognaphalium biolettii | Asteraceae | Sunflower | Native, Common, Perennial , typically blooms from January to May, coastal scrub and chaparral JanuaryFebruaryMarchAprilMay 202212 |
 | Valley Oak | Quercus lobata | Fagaceae | Beech | Native, Common, Tree , typically blooms from March to May, open woodlands, riparian forests, valley savannas MarchAprilMay 202305 |
 | Variable Linanthus | Leptosiphon parviflorus | Polemoniaceae | Phlox | Native, Uncommon, Annual herb, typically blooms from March to May, Coastal Sage MarchAprilMay 201706 |
 | Vinegar Weed | Trichostema lanceolatum | Lamiaceae | Mint | Native, Common, Annual herb, typically blooms from June to November, dry, sunny fields or low hills
JuneJulyAugustSeptemberOctoberNovember 200609 |
 | Violet Snapdragon | Antirrhinum nuttallianum | Plantaginaceae | Plantain | Native, Uncommon, Annual herb, typically blooms from March to June, Grassy slopes and canyons MarchAprilMayJune 201912 |
 | Virgin's Bower | Clematis lasiantha | Ranunculaceae | Buttercup | Endemic, Common, Perennial Vine , typically blooms from January to May, Canyons and Chaparral, open places in Woodlands JanuaryFebruaryMarchAprilMay 201005 |
 | Wand Buckwheat | Eriogonum elongatum | Polygonaceae | Buckwheat | Native, Common, Perennial , typically blooms from July to November, coastal scrub and chaparral JulyAugustSeptemberOctoberNovember 202208 |
 | Western Virgins Bower | Clematis ligusticifolia | Ranunculaceae | Buttercup | Native, Common, Perennial Vine , typically blooms from June to September, riparian JuneJulyAugustSeptember 202202 |
 | Western Wallflower | Erysimum capitatum | Brassicaceae | Mustard | Native, Common, Perennial , typically blooms from January to June, Openings in Chaparral JanuaryFebruaryMarchAprilMayJune 201909 |
 | Whispering Bells | Emmenanthe penduliflora | Boraginaceae | Borage | Native, Uncommon, Annual herb, typically blooms from February to June, Chaparral, Coastal Sage FebruaryMarchAprilMayJune 201412 |
 | White Chaparral Currant | Ribes indecorum | Grossulariaceae | Gooseberry | Native, Common, Perennial , typically blooms from November to February, coastal scrub and chaparral NovemberDecemberJanuaryFebruaryMarchAprilMayJuneJulyAugustSeptember 202302 |
 | White Hedge Nettle | Stachys albens | Lamiaceae | Mint | Endemic, Common, Perennial , typically blooms from May to September, Grassands Coastal Sage MayJuneJulyAugustSeptember 201810 |
 | White Sage | Salvia apiana | Lamiaceae | Mint | Native, Common, Shrub , typically blooms from April to July, Coastal Sage AprilMayJuneJuly 201609 |
 | White Snapdragon | Antirrhinum coulterianum | Plantaginaceae | Plantain | Native, Uncommon, Annual herb, typically blooms from April to July, Sage, Chapparal AprilMayJuneJuly 201903 |
 | Wild Cucumber | Marah macrocarpus | Cucurbitaceae | Gourd | Native, Common, Perennial Vine herb vine, typically blooms from November to April, woodlands, chaparral, coastal sage scrub NovemberDecemberJanuaryFebruaryMarchAprilMayJuneJuly 200704 |
 | Wild Heliotrope | Heliotropium curassavicum | Boraginaceae | Borage | Native, Common, Perennial , typically blooms from April to November, Moist to Dry Saline Soils AprilMayJuneJulyAugustSeptemberOctoberNovember 201703 |
 | Wild Peony | Paeonia californica | Paeoniaceae | Peony | Endemic, Common, Perennial , typically blooms from December to May, Chaparral, meadows & ridges DecemberJanuaryFebruaryMarch 200602 |
 | Wild Rose | Rosa californica | Rosaceae | Rose | Native, Common, Shrub , typically blooms from March to September, moist places in many plant communities MarchAprilMayJuneJulyAugustSeptember 201208 |
 | Wild Sweet Pea | Lathyrus vestitus | Fabaceae | Legume | Native, Common, Perennial Vine , typically blooms from March to August, Chaparral, Oak Woodlands MarchAprilMayJuneJulyAugust 201503 |
 | Wild radish | Raphanus sativus | Brassicaceae | Mustard | Invasive, Common, Annual herb, typically blooms from December to May, fields, meadows, disturbed places DecemberJanuaryFebruaryMarch 201001 |
 | Willow Herb Clarkia | Clarkia epilobioides | Onagraceae | Evening Primrose | Native, Common, Annual herb, typically blooms from April to May, Oak Woodland AprilMay 201709 |
 | Wind Poppy | Papaver heterophyllum | Papaveraceae | Poppy | Native, Uncommon, Annual herb, typically blooms from April to May, Chaparral, grassy areas AprilMay 201906 |
 | Wine Cup Clarkia | Clarkia purpurea | Onagraceae | Evening Primrose | Native, Common, Annual herb, typically blooms from March to June, Grassy Openings MarchAprilMayJune 202010 |
 | Wishbone Bush | Mirabilis laevis | Nyctaginaceae | Four O'Clock | Native, Common, Perennial , typically blooms from November to May, Chaparral and Coastal Sage Scrub NovemberDecemberJanuaryFebruaryMarchAprilMayJune 201012 |
 | Woodland Star | Lithopragma affine | Saxifragaceae | Saxifrage | Native, Common, Perennial , typically blooms from March to May, Grasslands, mountains MarchAprilMay 201702 |
 | Woolly Blue Curls | Trichostema lanatum | Lamiaceae | Mint | Native, Common, Perennial , typically blooms from February to June, chaparral, coastal sage scrub FebruaryMarchAprilMayJune 200607 |
 | Wooly Sapphire | Eriastrum sapphirinum | Polemoniaceae | Phlox | Native, Uncommon, Annual herb, typically blooms from April to July, Chaparral AprilMayJuneJuly 201508 |
 | Yellow Monkey Flower | Diplacus brevipes | Phrymaceae | Lopseed | Native, Common, Annual herb, typically blooms from April to July, Open Chaparral AprilMayJuneJuly 202003 |
 | Yellow Throated Phacelia | Phacelia brachyloba | Boraginaceae | Borage | Native, Uncommon, Annual , typically blooms from March to June, coastal sage scrub and chaparral MarchAprilMayJune 202310 |
 | Yerba Mansa | Anemopsis californica | Saururaceae | Lizard Tail | Native, Uncommon, Perennial , typically blooms from March to July, Moist soils MarchAprilMayJuneJuly 201904 |
 | Yerba Santa | Eriodichtyon crassifolium | Boraginaceae | Waterleaf | Native, Common, Shrub , typically blooms from January to June, Sandy, rocky areas in chaparral and sage scrub JanuaryFebruaryMarchAprilMayJune 200812 |
 | Yucca | Hesperoyucca whipplei | Agavaceae | Agave | Native, Common, Perennial , typically blooms from April to June, chaparral or coastal sage scrub
AprilMayJune 200606 |