Click Family Link for Photo Key of all Species Available (Not all species photos yet in index.)
| Botanic Species Name | Common Species Name | Family |
| Abronia umbellata ssp. umbellata | Verbena, Beach-Sand | Nyctaginaceae |
| Abronia villosa var villosa | Verbena, Desert-Sand | Nyctaginaceae |
| Acacia longifolia | Wattle, Golden (non-native Acacia) | FabaceaeRadial |
| Acanthomintha ilicifolia | Thornmint, San Diego | Lamiaceae |
| Achillea millefolium | Yarrow, White aka Milfoil | Asteraceae Radiate |
| Acourtia microcephala | Perezia aka Sacapellote | Asteraceae Bilabiate |
| Adenostoma fasciculatum | Chamise aka Greasewood | Rosaceae |
| Adolphia californica | Spineshrub | Rhamnaceae |
| Agave americana | Agave, American | Agavaceae **Note2** |
| Agave deserti | Agave, Desert aka Century Plant | Agavaceae **Note2** |
|
Agoseris retrorsa |
Spear-Leaf Agoseris |
|
| Aliciella latifolia | Gilia, Broad-Leaf | Polemoniaceae |
| Allionia incarnata | Windmills, Trailing | Nyctaginaceae |
| Allium haematochiton | Onion, Red-Skin | Alliaceae **Note2** |
| Allium parryi | Onion, Parry's | Alliaceae **Note2** |
| Allium peninsulare | Onion, Red-flower | Alliaceae **Note2** |
| Allium praecox | Onion, Early | Alliaceae **Note2** |
| Allophyllum gilioides | False-Gilia, Straggling | Polemoniaceae |
| Amaranthus fimbriatus | Fringe Amaranth | Amaranthaceae |
| Ambrosia dumosa | Bur-Sage, White | Asteraceae Disciform |
|
Ambrosia salsola var salsola |
Burrobush aka Cheesebush |
|
| Amsinckia menziesii ± | Fiddleneck | Boraginaceae |
| Anagallis arvensis var. arvensis | Pimpernel, Scarlet | Primulaceae |
| Anagallis arvensis var. caerulea | Pimpernel, Blue | Primulaceae |
| Anemopsis californica | Yerba-Mansa, Lizard's Tail | Saururaceae |
| Anthemis cotula | Mayweed, Dog aka Stinking Chamomile | Asteraceae Radiate |
| Antirrhinum coulterianum | Snapdragon, Coulter's | Plantaginaceae **Note1** |
| Antirrhinum filipes | Desert Snapdragon | Plantaginaceae **Note1** |
| Antirrhinum kelloggii | Snapdragon, Climbing | Plantaginaceae **Note1** |
| Antirrhinum nuttallianum | Snapdragon, Nuttall's | Plantaginaceae **Note1** |
| Apiastrum angustifolium | Mock-Parsley | Apiaceae |
| Aquilegia formosa | Columbine, California | Ranunculaceae |
| Arabis perennans | Rock-Cress, Nevada | Brassicaceae |
| Arabis sparsiflora | Rock-Cress | Brassicaceae |
| Arctostaphylos glandulosa | Manzanita | Ericaceae |
| Arctostaphylos glauca | Manzanita | Ericaceae |
| Argemone munita | Prickly Poppy | Papaveraceae |
| Asclepias californica | Milkweed, California aka Round-hood | Apocynaceae |
| Asclepias eriocarpa | Milkweed, Indian aka Woollypod | Apocynaceae |
| Astragalus douglasii var. parishii | Locoweed, Parish's | FabaceaeVetch |
| Astragalus lentiginosus var. borreganus | Milkvetch, Borrego aka Borrego Locoweed | FabaceaeVetch |
| Astralagus trichopodus var. lonchus | Locoweed, Ocean | FabaceaeVetch |
| Baccharis pilularis | Chaparral Broom | Asteraceae Disciform |
| Baccharis salicifolia aka B. glutinosa | Mule Fat aka Willow, Seep | Asteraceae Disciform |
| Baileya pauciradiata | Marigold, Colorado-Desert | Asteraceae Radiate |
| Barbarea orthoceras | Cress, Winter | Brassicaceae |
| Bebbia juncea | Sweetbush | Asteraceae Discoid |
| Berberis aquifolium var dictyota | Barberry, California | Berberidaceae |
| Berberis pinnata | Barberry, Shiny-Leaf | Berberidaceae |
| Blennosperma nanum var. nanum | Blennosperma, Common | Asteraceae Radiate |
| Bloomeria clevelandii | Golden-Stars, San Diego | Themidaceae **Note2** |
| Bloomeria crocea | Golden-Stars, Common | Themidaceae **Note2** |
| Boerhavia coccinea | Ringstem, Red | Nyctaginaceae |
| Brassica nigra | Mustard, Black | Brassicaceae |
| Brassica rapa | Turnip a.k.a. Field Mustard | Brassicaceae |
| Brassica tournefortii | Wild Turnip | Brassicaceae |
| Brodiaea filifolia | Brodiaea, Thread-Leaf | Themidaceae **Note2** |
| Brodiaea terrestris | Brodiaea, Dwarf | Themidaceae **Note2** |
| Brodiaea orcuttii | Brodiaea, Orcutt's | Themidaceae **Note2** |
| Calandrinia ciliata | Red Maids | Portulacaceae |
| Calliandra eriophylla | Fairy Duster | FabaceaeRadial |
| Calochortus albus | Globe Lily, White | Liliaceae **Note2** |
| Calochortus concolor | Lily, Golden-Bowl Mariposa | Liliaceae **Note2** |
| Calochortus dunnii | Lily, Mariposa Dunn's | Liliaceae **Note2** |
| Calochortus invenustus | Lily, Shy Mariposa | Liliaceae **Note2** |
| Calochortus splendens | Lily, Mariposa Splendid | Liliaceae **Note2** |
| Calochortus weedii var. weedii | Lily, Mariposa Weed's | Liliaceae **Note2** |
| Calochortus [species TBD] | Lily, Yellow Mariposa [species TBD] | Liliaceae **Note2** |
|
Calycoseris wrightii |
White Tack-Stem |
|
| Calystegia macrostegia var tenuifolia | Morning Glory, San Diego | Convolvulaceae |
| Calystegia occidentalis ssp. fulcrata | Morning Glory, Western | Convolvulaceae |
| Camissonia bistorta ± | Sun-Cup, California | Onagraceae |
| Camissonia boothii | Desert Lantern | Onagraceae |
| Camissonia californica | False Mustard | Onagraceae |
| Camissonia cardiophylla ssp. cardiophylla | Evening-Primrose | Onagraceae |
| Camissonia cheiranthifolia var. suffruticosa | Sun-Cup, Beach Evening Primrose | Onagraceae |
| Camissonia claviformis ssp. aurantiaca | Primrose, Pinnate-Leaf ( Brown-eyed) Evening | Onagraceae |
| Camissonia claviformis ssp. yumae | Primrose, Peirson's Evening | Onagraceae |
| Camissonia hirtella | Sun-Cup, Field | Onagraceae |
| Cardamine californica | Milkmaids aka Toothwort | Brassicaceae |
| Cardionema ramosissimum | Tread Lightly | Caryophyllaceae |
| Carduus pycnocephalus | Thistle, Italian | Asteraceae Discoid |
| Carpobrotus aequilaterus | Fig, Sea | Aizoaceae |
| Carpobrotus edulis | Fig, Hottentot | Aizoaceae |
| Castilleja affinis ssp. affinis | Paintbrush, Indian/Coast | Orobanchaceae **Note1** |
| Castilleja densiflora ssp. gracilis | Owl's Clover, Parish's | Orobanchaceae **Note1** |
| Castilleja exserta ssp exserta | Owl's Clover, Purple | Orobanchaceae **Note1** |
| Castilleja foliolosa | Paintbrush, Woolly Indian | Orobanchaceae **Note1** |
| Castilleja minor ssp spiralis | Paintbrush, Annual aka Calif Threadtorch | Orobanchaceae **Note1** |
| Caulanthus cooperi | Cooper's Caulanthus | Brassicaceae |
| Caulanthus heterophyllus | San Diego Jewelflower | Brassicaceae |
| Ceanothus crassifolius | Lilac, Hoary-Leaf | Rhamnaceae |
| Ceanothus cuneatus var cuneatus | Buck Brush | Rhamnaceae |
| Ceanothus greggii var perplexans | Lilac, Cup-leaf | Rhamnaceae |
| Ceanothus palmeri | Lilac, Palmer's | Rhamnaceae |
| Ceanothus tomentosus | Lilac, Ramona | Rhamnaceae |
| Ceanothus verrucosus | Lilac, Wart-Stem | Rhamnaceae |
|
Centaurea melitensis ± |
Tocalote, Yellow Star Thistle |
|
| Centaurium venustum | Canchalagua | Gentianaceae |
| Cerastium glomeratum | Chickweed, Mouse-Ear | Caryophyllaceae |
| Cercidium floridum ssp. floridum | Palo Verde, Blue | FabaceaeRadial |
| Cercocarpus betuloides var betuloides | Mahogany, Birch-Leaf Mountain | Rosaceae |
| Cercocarpus minutiflorus | Mahogany, San Diego Mountain | Rosaceae |
| Chaenactis artemisiifolia | Pincushion, Artemisia | Asteraceae Discoid |
| Chaenactis fremontii | Pincushion, Desert | Asteraceae Discoid |
| Chaenactis glabriuscula var. orcuttiana | Pincushion, Yellow aka Orcutt's | Asteraceae Discoid |
| Chamaesyce melanadenia | Spurge, Squaw | Euphorbiaceae |
| Chamaesyce polycarpa | Spurge, Small-Seed | Euphorbiaceae |
| Chilopsis linearis ssp. arcuata | Desert Willow | Bignoniaceae |
| Chlorogalum parviflorum | Soap-Plant aka Amole | Hyacinthaceae **Note2** |
| Chorizanthe brevicornu var. brevicornu | Brittle Spineflower | Polygonaceae |
| Chorizanthe fimbriata var. fimbriata | Spineflower, Fringed | Polygonaceae |
| Chorizanthe fimbriata var. laciniata | Spineflower, Laciniate | Polygonaceae |
| Chorizanthe leptotheca ± | Spineflower, Ramona | Polygonaceae |
| Chorizanthe procumbens | Spineflower, Prostrate | Polygonaceae |
| Chorizanthe staticoides ± | Turkish Rugging | Polygonaceae |
| Chrysanthemum coronarium | Chrysanthemum, Garland | Asteraceae Radiate |
| Chrysothamnus paniculatus | Rabbitbush, Punctate | Asteraceae Discoid |
| Cirsium occidentale var. californicum | Thistle, California | Asteraceae Discoid |
| Cirsium scariosum (formerly C. tioganum | Thistle, Birds-Nest aka Dwarf or Drummond's Thistle | Asteraceae Discoid |
| Cistus villosus | Rockrose, Pink | Cistaceae |
| Clarkia purpurea | Clarkia, Four-Spot | Onagraceae |
| Clarkia rhomboidea | Clarkia, Diamond | Onagraceae |
| Claytonia perfoliata var. perfoliata | Miner's Lettuce | Portulacaceae |
| Clematis pauciflora | Virgin's Bower, Small-Leaf aka Ropevine | Ranunculaceae |
| Cleomella obtusifolia | Stinkweed, Mojave | Capparaceae |
| Cneoridium dumosum | Bushrue aka Spice Bush | Rutaceae |
| Collinsia childii | Blue-eyed Mary, Child's | Plantaginaceae **Note1** |
| Collinsia concolor | Chinese Houses, Southern | Plantaginaceae **Note1** |
| Collinsia heterophylla | Chinese Houses | Plantaginaceae **Note1** |
| Collinsia parviflora | Blue-eyed Mary, Small-flower | Plantaginaceae **Note1** |
| Collomia grandiflora | Collomia, Grand | Polemoniaceae |
| Cordylanthus rigidus | Bird's Beak | Orobanchaceae **Note1** |
| Coreopsis maritima | Coreopsis aka Sea Dahlia | Asteraceae Radiate |
| Corethrogyne filaginafolia var. filaginafolia | Aster, California | Asteraceae Radiate |
|
Cotula coronopifolia |
African Brassbuttons |
|
| Cotyledon orbiculata var. oblonga | Cotyledon | Crassulaceae |
| Cressa truxillensis var. vallicola | Alkali Weed | Convolvulaceae |
| Crassula connata | Pygmy Weed | Crassulaceae |
| Croton californicus | Croton, California | Euphorbiaceae |
| Cryptantha angustifolia ± | PopcornFlower, Narrowleaf | Boraginaceae |
| Cryptantha intermedia | Cryptantha, Nievitas | Boraginaceae |
| Cryptantha muricata ± | Cryptantha, Prickly | Boraginaceae |
| Cylindropuntia bigelovii | Cactus, Teddybear Cholla | Cactaceae |
| Cylindropuntia ganderi | Cactus, Gander's Cholla | Cactaceae |
| Cylindropuntia prolifera | Cactus, Coast Cholla | Cactaceae |
| Cylindropuntia wolfii | Cactus, Wolf's Cholla | Cactaceae |
| Datura discolor | Jimson Weed | Solanaceae |
| Datura wrightii | Jimson Weed | Solanaceae |
| Deinandra fasciculata | Tarweed, Fascicled | Asteraceae Radiate |
| Delphinium cardinale | Larkspur, Scarlet | Ranunculaceae |
| Delphinium parryi ssp. parryi | Larkspur, Parry's | Ranunculaceae |
| Dendromecon rigida | Poppy, Bush/Tree | Papaveraceae |
| Descurainia pinnata | Tansy Mustard | Brassicaceae |
| Dicentra chrysantha | Ear-Drops, Golden | Papaveraceae |
| Dichelostemma capitatum ssp. capitatum | Blue Dicks aka Wild Hyacinth | Themidaceae **Note2** |
| Dicoria canescens | Desert Dicoria | Asteraceae Disciform |
| Ditaxis lanceolata | Silverbush, Desert | Euphorbiaceae |
| Ditaxis neomexicana | Ditaxis, New Mexico | Euphorbiaceae |
| Dithyrea californica | California Spectacle-Pod | Brassicaceae |
| Dodecatheon clevelandii ssp clevelandii | Star, Maroon Shooting | Primulaceae |
| Dodecatheon clevelandii ssp clevelandii | Star, White Shooting | Primulaceae |
| Downingia bella | Downingia, Hoover's | Campanulaceae |
| Downingia concolor ssp. brevior | Downingia, Cuyamaca | Campanulaceae |
| Downingia cuspidata | Downingia, Toothed | Campanulaceae |
| Dudleya brevifolia | Dudleya, Short-Leaved | Crassulaceae |
| Dudleya edulis | Ladies Fingers | Crassulaceae |
| Dudleya lanceolata | Dudleya | Crassulaceae |
| Dudleya pulverulenta | Dudleya | Crassulaceae |
| Emmenanthe penduliflora | Whispering Bells | Hydrophyllaceae |
| Encelia californica | Encelia, California | Asteraceae Radiate |
| Encelia farinosa var farinosa | Brittlebush aka Incienso or Desert Encelia | Asteraceae Radiate |
| Encelia frutescens | Rayless Encelia | Asteraceae Discoid |
| Ephedra viridis | Ephedra, Green | Ephedraceae |
| Epilobium angustifolium | Fireweed | Onagraceae |
| Epilobium canum | Fuchsia, California | Onagraceae |
| Eremalche rotundifolia | Desert Five-Spot | Malvaceae |
| Eriastrum eremicum | Woolly-Star, Desert | Polemoniaceae |
| Eriastrum filifolium | Woolly-Star, Thread-leaf | Polemoniaceae |
| Eriastrum sapphirinum | Woolly-Star, Sapphire | Polemoniaceae |
| Ericameria linearifolia | Goldenbush, Interior | Asteraceae Radiate |
| Erigeron foliosus var. foliosus | Fleabane Aster aka Leafy Daisy | Asteraceae Radiate |
| Eriodictyon crassifolium | Yerba-Santa | Hydrophyllaceae |
| Eriogonum elongatum | Buckwheat, Tall | Polygonaceae |
| Eriogonum fasciculatum var. foliosum | Buckwheat, California | Polygonaceae |
| Eriogonum fasciculatum var. polifolium | Buckwheat, California Mojave | Polygonaceae |
| Eriogonum gracile var. gracile | Buckwheat, Slender | Polygonaceae |
| Eriogonum inflatum | Desert Trumpet | Polygonaceae |
| Eriogonum reniforme ± | Buckwheat, Kidney-leaf Wild | Polygonaceae |
| Eriogonum thomasii ± | Buckwheat, Thomas' | Polygonaceae |
| Eriogonum wrightii ssp. nudosum | Buckwheat, Knotty | Polygonaceae |
| Eriophyllum confertiflorum var. confertiflorum | Yarrow, Golden | Asteraceae Radiate |
| Erodium botrys | Filaree, Long-Beaked | Geraniaceae |
| Erodium brachycarpum | Filaree, Foothill aka Short-Fruited F. | Geraniaceae |
| Erodium cicutarium | Filaree, Red-Stem | Geraniaceae |
| Eryngium aristulatum var. parishii | Thistle, Coyote aka San Diego Button Celery | Apiaceae |
| Erysimum capitatum | Wallflower, Western | Brassicaceae |
| Eschscholzia californica | Poppy, California | Papaveraceae |
| Eschscholzia minutiflora | Poppy, Pygmy Gold | Papaveraceae |
| Eucrypta chrysanthemifolia | Spotted Eucrypta | Hydrophyllaceae |
| Fagonia laevis | Fagonia, California | Zygophyllaceae |
| Ferocactus cylindraceus var cylindraceus | Cactus, California Barrel | Cactaceae |
| Ferocactus cylindraceus var lecontei | Cactus, California Barrel | Cactaceae |
| Ferocactus viridescens | Cactus, Coast Barrel | Cactaceae |
| Fouquieria splendens ssp splendens | Ocotillo | Fouquieriaceae |
| Fragaria vesca ssp. californica | Strawberry, California Woodland | Rosaceae |
| Frankenia salina | Alkali Heath | Frankeniaceae |
| Fremontodendron californicum ssp. californicum | Fremontia, California a.k.a. Flannelbush | Sterculiaceae |
| Fritillaria biflora | Lily, Chocolate | Liliaceae **Note2** |
| Funastrum cynanchoides ssp. hartwegii | Milkweed, Vining | Apocynaceae |
| Funastrum hirtellum | Townula, Trailing | Apocynaceae |
| Galium andrewsii ssp. andrewsii | Bedstraw, Pholox-Leaf | Rubiaceae |
| Galium angustifolium | Bedstraw, Narrow-Leaved | Rubiaceae |
| Galium aparine | Bedstraw, Common aka Goose Grass | Rubiaceae |
| Geraea canescens | Sunflower, Desert | Asteraceae Radiate |
| Gilia angelensis (or G. australis) | Gilia, Grassland | Polemoniaceae |
| Gilia capitata ssp. abrotanifolia | Gilia, Ball | Polemoniaceae |
| Gilia diegensis | Gilia, San Diego | Polemoniaceae |
| Gilia filiformis (?? TBD) | Gilia, Thin | Polemoniaceae |
| Gilia stellata | Gilia, Star | Polemoniaceae |
|
Gnaphalium californicum |
California Everlasting |
|
|
Gnaphalium luteo-album |
Everlasting Cudweed |
|
| Grindelia hirsutula var. hallii | Gumplant, San Diego | Asteraceae Radiate |
| Guillenia lasiophylla | California Mustard | Brassicaceae |
| Gutierrezia sarothrae | Matchweed, Broom | Asteraceae Radiate |
| Hazardia squarrosa var. squarrosa | Goldenbush, Sawtooth | Asteraceae Discoid |
| Hedypnois cretica | Hedypnois, Crete | Asteraceae Ligulate |
| Helianthemum scoparium var aldersonii | Rushrose, Common aka Rockrose | Cistaceae |
| Helianthus gracilentus | Sunflower, Slender | Asteraceae Radiate |
| Helianthus niveus ssp. canescens | Sunflower, Gray | Asteraceae Radiate |
| Heliotropium curassavicum | Heliotrope, Salt | Heliotropaceae |
| Hesperocallis undulata | Lily, Desert | Agavaceae **Note2** |
| Hesperoyucca whipplei | Yucca, Chaparral aka Our Lord's Candle | Agavaceae **Note2** |
| Heterotheca grandiflora | Telegraph Weed (also see Goldenaster) | Asteraceae Radiate |
| Horkelia clevelandii | Horkelia, Cleveland's | Rosaceae |
| Horsfordia newberryi | Yellow Feltplant | Malvaceae |
| Hulsea californica | Hulsea, San Diego | Asteraceae Radiate |
| Hypericum formosum var. scouleri | St. John's Wort | Hypericaceae |
|
Hypochaeris glabra ± |
Cats-Ear, Smooth |
|
| Hyptis emoryi | Lavender, Desert | Lamiaceae |
| Ipomopsis tenuifolia | Ipomopsis, Slender-Leaved | Polemoniaceae |
| Isocoma acradenia var. eremophila | Goldenbush, Alkali | Asteraceae Discoid |
| Isocoma menziesii var. vernonioides | Goldenbush, Coast | Asteraceae Discoid |
| Isomeris arborea | Bladderpod | Capparaceae |
| Jaumea carnosa | Jaumea, Marsh | Asteraceae Radiate |
| Justicia californica | Chuparosa | Acanthaceae |
| Keckiella antirrhinoides var. antirrhinoides | Keckiella aka Snapdragon Penstemon | Plantaginaceae **Note1** |
| Keckiella cordifolia | Penstemon, Heartleaf | Plantaginaceae **Note1** |
| Krameria erecta | Pima Rhatany | Krameriaceae |
| Krameria grayi | White Rhatany | Krameriaceae |
| Lamium amplexicaule | Henbit, Clasping | Lamiaceae |
| Langloisia setosissima ssp. setosissima | Langloisia, Bristly | Polemoniaceae |
| Larrea tridentata | Creosote Bush | Zygophyllaceae |
| Lasthenia coronaria | Goldfields, Southern | Asteraceae Radiate |
|
Lasthenia gracilis |
Goldfields, Common |
|
| Lathyrus vestitus ssp alefeldii | Pea, Canyon aka San Diego Sweetpea | FabaceaeOthers |
| Lavatera assurgentiflora | Mallow, Island | Malvaceae |
| Layia platyglossa | Tidy Tips | Asteraceae Radiate |
| Lepidium lasiocarpum var. lasiocarpum | Peppergrass, Sand | Brassicaceae |
| Leptosiphon floribundus ssp.glaber | Summer Snow | Polemoniaceae |
| Lessingia glandulifera var. glandulifera | Lessingia, Valley | Asteraceae Discoid |
| Lilium pardalinum ssp. pardalinum | Lily, Leopard | Liliaceae **Note2** |
| Limnanthes gracilis ssp. Parishii | Meadowfoam, Parish's Cuyamaca | Limnanthaceae |
| Limonium californicum var. mexicanum | Statice, Sea-Lavender | Plumbaginaceae |
| Limonium sinuatum | Statice, Marsh-Rosemary | Plumbaginaceae |
| Linanthus androsaceus ssp. luteolus | Linanthus, Common White | Polemoniaceae |
| Linanthus dianthiflorus | Ground-Pink | Polemoniaceae |
| Linanthus orcuttii | Linanthus, Orcutt's | Polemoniaceae |
| Linanthus parviflorus [Yellow] | Baby Stars | Polemoniaceae |
| Linaria canadensis | Toadflax, Large Blue | Plantaginaceae **Note1** |
| Linum lewisii var. lewisii | Flax, Wild | Linaceae |
| Lithophragma affine | Woodland Star | Saxifragaceae |
| Lobularia maritima | Alyssum, Sweet | Brassicaceae |
| Loeseliastrum matthewsii | Desert Calico | Polemoniaceae |
| Lomatium dasycarpum | Lomatium, Woolly-Fruit | Apiaceae |
| Lomatium lucidum | Lomatium, Shiny aka Biscuit Root | Apiaceae |
| Lomatium utriculatum | Lomatium, Common aka Bladder Parsnip | Apiaceae |
| Lonicera subspicata | Honeysuckle, Southern | Caprifoliaceae |
| Lotus argophyllus var. argophyllus | Silver-Leaf Lotus | FabaceaeLotus |
| Lotus corniculatus | Birdfoot Trefoil | FabaceaeLotus |
| Lotus grandiflorus var. grandiflorus | Grand Lotus | FabaceaeLotus |
| Lotus micranthus | Lotus, Miniature | FabaceaeLotus |
| Lotus purshianus | Clover, Spanish | FabaceaeLotus |
| Lotus rigidus | Lotus, Broom aka Desert Lotus etc... | FabaceaeLotus |
| Lotus scoparius var. scoparius | Deerweed, Coastal | FabaceaeLotus |
| Lotus strigosus | Lotus, Hairy | FabaceaeLotus |
| Lupinus arizonicus | Lupine, Arizona | FabaceaeLupine |
| Lupinus bicolor | Lupine, Miniature aka Dwarf | FabaceaeLupine |
| Lupinus concinnus | Lupine, Bajada | FabaceaeLupine |
| Lupinus excubitus var. austromontanus | Lupine, Grape Soda | FabaceaeLupine |
| Lupinus hirsutissimus | Lupine, Stinging | FabaceaeLupine |
| Lupinus microcarpus var densiflorus | Lupine, Chick | FabaceaeLupine |
| Lupinus sparsiflorus | Lupine, Coulter's | FabaceaeLupine |
| Lycium andersonii | Waterjacket | Solanaceae |
| Lycium brevipes var. brevipes | Desert Thorn, Common | Solanaceae |
| Lycium californicum | Desert Thorn, California | Solanaceae |
| Lycium cooperi | Desert Thorn, Peach | Solanaceae |
| Lycium fremontii | Thornbush, Fremont's aka Fremont's Desert Thorn | Solanaceae |
| Lythrum hyssopifolium | Loosestrife, Hyssop | Lythraceae |
| Malacothamnus fasciculatus | Mallow, Bush | Malvaceae |
|
Malacothrix glabrata |
Dandelion, Desert |
|
| Malosma laurina | Laurel Sumac | Anacardiaceae |
| Malvella leprosa | Mallow, Alkali | Malvaceae |
| Mammillaria dioica | Cactus, Fish-Hook | Cactaceae |
| Marah macrocarpus | Cucumber, Wild aka Man-Root | Cucurbitaceae |
| Marrubium vulgare | Horehound | Lamiaceae |
| Melilotus alba | Sweetclover, White | FabaceaeVetch |
| Melilotus indica | Sweetclover, Indian | FabaceaeVetch |
| Mentzelia albicaulis | Stick-Leaf a.k.a. Kuha | Loasaceae |
| Mentzelia involucrata | Blazing-Star, Sand | Loasaceae |
| Mentzelia montana | Mentzelia, Montane | Loasaceae |
| Mesembryanthemum crystallinum | Iceplant, Common | Aizoaceae |
| Microsteris gracilis ssp humilis | Phlox, Slender | Polemoniaceae |
| Mimulus aurantiacus | Monkeyflower, Coast (Orange) | Phrymaceae **Note1** |
| Mimulus bigelovii var. bigelovii | Monkeyflower, Bigelow's | Phrymaceae **Note1** |
| Mimulus brevipes | Monkeyflower, Yellow aka Slope Semaphore | Phrymaceae **Note1** |
| Mimulus fremontii | Monkeyflower, Fremont's | Phrymaceae **Note1** |
| Mimulus guttatus | Monkeyflower, Creek/Seep | Phrymaceae **Note1** |
| Mimulus puniceus | Monkeyflower, Coast (Red) | Phrymaceae **Note1** |
| Mirabilis laevis var. crassifolia | Wishbone Bush, Coastal | Nyctaginaceae |
| Mirabilis laevis var. retrorsa | Wishbone Bush, Desert | Nyctaginaceae |
| Mirabilis multiflora var. pubescens | Four O'Clock, Froebel's | Nyctaginaceae |
| Mohavea confertiflora | Ghost Flower | Plantaginaceae **Note1** |
| Monardella lanceolata var. lanceolata | Mustang Mint | Lamiaceae |
| Monardella linoides ssp. linoides | Flaxleaf Monardella | Lamiaceae |
| Monardella lanceolata ssp. lanceolata | Scarlet Monardella | Lamiaceae |
| Muilla maritima | Muilla, Common | Themidaceae **Note2** |
| Myoporum laetum | Ngaio | Scrophulariaceae **Note1** |
| Nama demissum var. demissum | Purple Mat | Hydrophyllaceae |
| Navarretia atractyloides | Skunkweed, Holly-Leaf | Polemoniaceae |
| Navarretia hamata ssp leptantha | Skunkweed | Polemoniaceae |
| Nemacladus pinnatifidus | Threadplant, Comb-Leaf | Campanulaceae |
| Nemacladus ramosissimus | Threadplant, Nuttall's | Campanulaceae |
| Nemophila menziesii var. integrifolia | Blue-Eyes, Baby (see Nemophila) | Hydrophyllaceae |
| Nemophila pedunculata | Nemophila, Meadow (see Blue-Eyes, Baby) | Hydrophyllaceae |
| Nicotiana glauca | Tobacco, Tree | Solanaceae |
| Nicotiana obtusifolia | Tobacco, Desert | Solanaceae |
| Nicotiana quadrivalvis | Tobacco, Indian | Solanaceae |
| Oenothera deltoides ssp. deltoides | Primrose, Dune Evening | Onagraceae |
| Oenothera elata | Primrose, Great Marsh Evening | Onagraceae |
| Opuntia basilaris var. basilaris | Cactus, Beavertail | Cactaceae |
| Opuntia littoralis ± | Cactus, Coast Prickly- Pear | Cactaceae |
| Osmadenia tenella aka Calycadenia t. | Three-Spot, Rosin Weed | Asteraceae Radiate |
| Oxalis albicans or corniculata | Oxalis aka Wood-Sorrel | Oxalidaceae |
| Oxalis pes-caprae | Oxalis weed aka Bermuda Buttercup | Oxalidaceae |
| Paeonia californica | Peony, California | Paeoniaceae |
| Palafoxia arida | Needles, Spanish | Asteraceae Discoid |
| Papaver californicum | Fire Poppy | Papaveraceae |
| Pectis papposa var papposa | Chinch Weed | Asteraceae Radiate |
| Penstemon centranthifolius | Scarlet Bugler | Plantaginaceae **Note1** |
| Penstemon heterophyllus var. heterophyllus | Penstemon, Foothill | Plantaginaceae **Note1** |
| Penstemon spectabilis | Penstemon, Showy | Plantaginaceae **Note1** |
| Pentachaeta aurea | Pentachaeta, Golden-Rayed | Asteraceae Radiate |
| Perityle emoryi | Rock Daisy, Emory's | Asteraceae Radiate |
| Petalonyx thurberi ssp. thurberi | Sandpaper Plant | Loasaceae |
| Petrorhagia dubia | Hairypink | Caryophyllaceae |
| Petunia parviflora | Petunia, Wild | Solanaceae |
| Phacelia brachyloba | Phacelia, Short-lobed | Hydrophyllaceae |
| Phacelia campanularia | Canterbury Bells, Desert | Hydrophyllaceae |
| Phacelia cicutaria var. hispida | Phacelia, Caterpillar | Hydrophyllaceae |
| Phacelia crenulata | Phacelia, Notched-Leaf | Hydrophyllaceae |
| Phacelia davidsonii | Phacelia, Davidson's | Hydrophyllaceae |
| Phacelia distans | Phacelia, Wild Heliotrope | Hydrophyllaceae |
| Phacelia grandiflora | Phacelia, Large-flowered | Hydrophyllaceae |
| Phacelia minor | Canterbury Bell, Wild | Hydrophyllaceae |
| Phacelia parryi | Phacelia, Parry's | Hydrophyllaceae |
| Pholistoma auritum | Fiesta Flower | Hydrophyllaceae |
| Phoradendron californicum | Mistletoe, Desert | Viscaceae |
| Phyla lanceolata | Lippia aka Frog-Fruit | Verbenaceae |
| Physalis crassifolia | Ground-Cherry, Greene's | Solanaceae |
| Picris echioides | Ox-Tongue, Bristly | Asteraceae Ligulate |
| Piperia cooperi | Orchid, Rein aka Slenderspire | Orchidaceae |
| Plagiobothrys acanthocarpus ± | PopcornFlower, Adobe | Boraginaceae |
| Plagiobothrys nothofulvus ± | PopcornFlower, Rusty | Boraginaceae |
| Plantago patagonica | Desert Plantain | Plantaginaceae |
| Platanus racemosa | Sycamore, California | Platanaceae |
| Platystemon californicus | Cream-Cups, Calif | Papaveraceae |
| Plectritis ciliosa | Plectritis | Valerianaceae |
| Pluchea odorata | Salt Marsh Fleabane | Asteraceae Disciform |
| Pluchea sericea | Arrow Weed | Asteraceae Disciform |
| Pogogyne abramsii | Mesa-mint, San Diego | Lamiaceae |
| Pogogyne nudiuscula | Mesa-mint, Otay | Lamiaceae |
| Potentilla glandulosa ssp. reflexa | Cinquefoil, Greene's | Rosaceae |
| Prosopis glandulosa var. torreyana | Honey Mesquite | FabaceaeRadial |
| Prunus fremontii | Apricot, Desert | Rosaceae |
|
Psilocarphus brevissimus var. brevissimus |
Woolly Marbles aka Woolly Heads |
|
| Psorothamnus emoryi | Indigobush, Emory's | FabaceaeClover |
| Psorothamnus schottii | Indigo Bush | FabaceaeOthers |
| Psorothamnus spinosus | Smoke-Tree | FabaceaeOthers |
| Quercus dumosa | Scrub Oak, Nutall's | Fagaceae |
|
Rafinesquia neomexicana |
Chicory, Desert |
|
| Ranunculus californicus | Buttercup, California | Ranunculaceae |
| Raphanus sativus | Wild Radish | Brassicaceae |
| Rhamnus ilicifolia | Redberry, Holly-Leaf | Rhamnaceae |
| Rhus integrifolia | LemonadeBerry | Anacardiaceae |
| Rhus ovata | Sugar Bush | Anacardiaceae |
| Rhus trilobata | Skunkbrush | Anacardiaceae |
| Ribes indecorum | Currant, Winter aka White Chaparral Current | Grossulariaceae |
| Ribes speciosum | Gooseberry, Fuchsia Flowered | Grossulariaceae |
| Ricinus communis | Castor Bean | Euphorbiaceae |
| Romneya coulteri | Poppy, Matilija | Papaveraceae |
| Rorippa nasturtium-aquaticum | Watercress | Brassicaceae |
| Rosa californica | Rose, Calif Wild | Rosaceae |