Caulanthus heterophyllus is a species of flowering plant in the family Brassicaceae known by the common names San Diego wild cabbage and San Diego jewelflower.
Erysimum teretifolium is a species of Erysimum known by the common names Santa Cruz wallflower and Ben Lomond wallflower. It is a very rare plant endemic to Santa Cruz County, California, where it grows on inland sand spits, chaparral, and sandstone deposits in the southern Santa Cruz Mountains. It is a California state and federally listed endangered species.
Layia munzii is a rare species of flowering plant in the family Asteraceae known by the common name Munz's tidytips, or Munz's layia.
Monolopia congdonii is a rare species of flowering plant in the family Asteraceae known by the common name San Joaquin woollythread. It is endemic to California, where it is known only from the southern San Joaquin Valley and one area in nearby Santa Barbara County. It is a federally listed endangered species.
Lepidium jaredii is a species of flowering plant in the mustard family known by the common name Jared's pepperweed. It is endemic to California, where it is known from the San Joaquin Valley to just within the central Coast Ranges.
Astragalus brauntonii is a rare species of milkvetch known by the common name Braunton's milkvetch. It is endemic to California, where it is known from fewer than 20 extant occurrences in the hills and mountains surrounding the Los Angeles Basin in Southern California. This is a federally listed endangered species in the United States.
Caulanthus amplexicaulis is a species of flowering plant in the family Brassicaceae known by the common name claspingleaf wild cabbage.
Cirsium loncholepis is a rare species of thistle known by the common name La Graciosa thistle. It is endemic to California, where it is known from about 15 remaining occurrences in wetlands where southwestern San Luis Obispo County borders northwestern Santa Barbara County. It grows in coastal scrub and sand dunes, marshes, and moist grasslands in the watersheds of local rivers, including the Santa Maria River. It is a federally listed endangered species.
Clarkia tembloriensis is a rare species of flowering plant in the evening primrose family, known by the common name Temblor Range clarkia and belonging to the Onagraceae family.
Collinsia multicolor is a species of flowering plant in the plantain family, known by the common names San Francisco blue eyed Mary and San Francisco collinsia. It is endemic to the San Francisco Bay Area, where it is known from San Francisco to Santa Cruz. As of 2008 there are 22 known occurrences. Populations south of Santa Cruz have been extirpated.
Eremalche parryi is a species of flowering plant in the mallow family known by the common name Parry's mallow.
Eryngium racemosum is a rare species of flowering plant in the family Apiaceae known by the common name delta eryngo, or delta button celery.
Leptosiphon grandiflorus is a species of flowering plant in the phlox family known by the common names large-flower linanthus and large flowered leptosiphon.
Lupinus tidestromii is a rare species of lupine known by the common names clover lupine and Tidestrom's lupine. It is endemic to the coastline of California just to the north and south of the Golden Gate in Sonoma, Marin, and Monterey Counties. It is a plant of the sand dunes at separate beach locations in these counties. A very limited amount of this plant's habitat remains; it is a federally listed endangered species. Construction of golf courses on the Monterey Peninsula caused the extirpation of two known occurrences, and boardwalks were built at Asilomar State Beach to prevent trampling of the delicate dune habitat there.
Pogogyne nudiuscula is a rare species of flowering plant in the mint family known by the common name Otay mesa mint. It is native to southern San Diego County, California, where it is known only from Otay Mesa near the border with Baja California. It was identified on land south of the Mexican border, but these occurrences have probably been extirpated. It is now known from seven vernal pool complexes just north of the border, and it is a federally listed endangered species of the United States.
Sibara filifolia, the Santa Cruz Island winged rockcress or Santa Cruz Island rockcress, is a rare species of flowering plant in the family Brassicaceae. It is endemic to the Channel Islands of California, where it is now known from a few occurrences on San Clemente Island and one population on Catalina Island.
Stylocline citroleum is a rare species of flowering plant in the family Asteraceae known by the common name oil neststraw.
Suaeda californica is a rare species of flowering plant in the amaranth family known by the common name California seablite. It is now endemic to San Luis Obispo County, California, where it is known from a few occurrences in the marshes around Morro Bay, historical populations around San Francisco Bay have been extirpated.
Navarretia ojaiensis is a rare species of flowering plant in the phlox family known by the common name Ojai navarretia.
Acanthomintha ilicifolia, known by the common name San Diego thornmint, is a rare species of flowering plant in the mint family. It is native to Baja California and San Diego County, California, where it is a resident of the chaparral and coastal sage scrub plant communities and vernal pools.
