Natural history of Los Angeles County, California

Astragalus pycnostachyus is a species of milkvetch known by the common name marsh milkvetch. It is endemic to the coastline of California, where it grows in wet saline habitat such as marshes.

Ceanothus arboreus is a species of perennial shrub to small tree in the family Rhamnaceae, commonly known as the feltleaf ceanothus, island ceanothus, and island mountain lilac. It is the largest member of the California lilacs (the Ceanothus genus), and is characterized with glossy, dark green foliage that is adorned by pale blue to white flowers in bloom. It is endemic to the Channel Islands of California and Guadalupe Island in Mexico, only being re-discovered on Guadalupe Island after the elimination of feral goats.

The Mojave fringe-toed lizard (Uma scoparia) is a species of medium-sized, white or grayish, black-spotted diurnal lizard in the family Phrynosomatidae. It is adapted to arid climates and is most commonly found in sand dunes within the Mojave Desert. Fringe-toed lizards are characterized by their fringed scales on their hind toes which make locomotion in loose sand possible.

Deinandra minthornii — (syn. Hemizonia minthornii) — is a rare California species of flowering plant in the family Asteraceae known by the common name Santa Susana tarplant, or Santa Susana tarweed. It is listed as a rare species by the California Department of Fish and Wildlife and on the California Native Plant Society Inventory of Rare and Endangered Plants of California.

Pentachaeta lyonii, the Lyon's pentachaeta or Lyon's pygmydaisy, is an annual plant in the family Asteraceae. It is endemic to southern California, where it is now known only from a few areas on the heavily developed coastline of Los Angeles and Ventura counties. It is a federally listed endangered species.

Arctostaphylos catalinae, known by the common name Santa Catalina Island manzanita, is a species of manzanita native to Southern California. The evergreen shrub is found growing naturally only on Catalina and Santa Cruz Islands on the coast ridges. It thrives in maritime chaparral and can be used in coastal gardens.

Galium jepsonii, with the common name Jepson's bedstraw, is a rare flowering plant species in the Rubiaceae — Madder family.

Lepechinia rossii is a rare species of flowering plant in the mint family known by the common name Ross' pitcher sage.

Crossosoma californicum, known by the common name California rockflower, is one of only a few species in the flowering plant family Crossosomataceae.

Suaeda esteroa is a species of flowering plant in the family Amaranthaceae known by the common name estuary seablite. It is a yellow-green to reddish subshrub with fleshy, succulent leaves. It is native to the estuaries and salt marshes of coastal southern California and Baja California.