Coastal sage scrub, also known as coastal scrub, CSS, or soft chaparral, is a low scrubland plant community of the California coastal sage and chaparral subecoregion, found in coastal California and northwestern coastal Baja California. It is within the California chaparral and woodlands ecoregion, of the Mediterranean forests, woodlands, and scrub biome.
Larger shrubs include:
Herbaceous plants, grasses, and in some locales, cacti and succulents, are also part of the flora. Hesperoyucca whipplei, colloquially known as Chaparral Yucca, is commonplace throughout the climate zone.
The coastal sage scrub plant community is divided into three geographical subtypes—northern coastal scrub, southern coastal scrub, and maritime succulent scrub.
The coastal scrub communities are divided into three regions:
The Northern Coastal Scrub consists of prairie, which is terraces with deep alluvial soils, and scrub, which is found on steeper slopes and ravine areas. Evergreen shrubs and subshrubs, which are soft leaves. They are found in semi-open with a height of 2–3 meters, with multiple layers. Some examples of the plant species that can be found are Bush monkeyflower (Mimulus aurantiacus), Poison oak (Toxicodendron diversilobum), Coffee berry (Frangula californica), Golden yarrow (Eriophyllum confertiflorum).
California sagebrush (Artemisia californica) can be found in Coastal Sage Scrub community, especially in Orange County. Some other plant species that can be found is also giant coreopsis (Coreopsis gigantea), Californian black sage (Salvia mellifera), California buckwheat (Eriogonum fasciculatum), and Californian white sage (Salvia apiana).
Plant species that can be found in Maritime Succulent Scrub is coast prickly pear (Opuntia littoralis), coast barrel cactus (Ferocactus viridescens), cliff spurge (Euphorbia misera), bush rue (Cneoridium dumosum), and Dudleya spp.
Northern coastal scrub occurs along the Pacific Coast from the northern San Francisco Bay Area to southern Oregon. It frequently forms a landscape mosaic with the California coastal prairie plant community.
The predominant plants are low evergreen shrubs and herbs. Characteristic shrubs include coyote brush (Baccharis pilularis), yerba santa (Eriodictyon californicum), coast silk-tassel (Garrya elliptica), salal (Gaultheria shallon), and yellow bush lupine (Lupinus arboreus). Herbaceous species include western blue-eyed grass (Sisyrinchium bellum), Douglas iris (Iris douglasiana), and grasses.
Southern coastal scrub is mostly found along the maritime Central Coast region, and the terraces and mountains with coastal climate influence in Southern California. Its distribution extends from the southwestern San Francisco Bay Area in the north, through Big Sur, Vandenberg Air Force Base, the Oxnard Plain, the Los Angeles Basin, most of Orange County, parts of Riverside County, coastal San Diego County, and the northwestern region of Baja California state in Mexico, including the areas around Tijuana and Ensenada.
A few rare and endangered species occur in southern coastal scrub habitats. For example, the coastal California gnatcatcher (Polioptila californica californica) is a threatened bird species endemic to the coastal sage scrublands. Other endemic fauna includes the El Segundo blue butterfly in the LAX dunes; and the Palos Verdes blue butterfly (Glaucopsyche lygdamus palosverdesensis), at only one site on the Palos Verdes Peninsula.
The endangered Torrey pine (Pinus torreyana) is the dominant tree at Torrey Pines State Natural Reserve in San Diego, one of only two known stands of this pine species.[1]