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.
- Plant community
Coastal sage scrub is characterized by low-growing aromatic, and drought-deciduous shrubs adapted to the semi-arid Mediterranean climate of the coastal lowlands. The community is sometimes called "soft chaparral" due to the predominance of soft, drought-deciduous leaves in contrast to the hard, waxy-cuticled leaves on sclerophyllous plants of California's chaparral communities.
Characteristic shrubs and subshrubs include:
- California sagebrush (Artemisia californica)
- Black sage (Salvia mellifera)
- White sage (Salvia apiana)
- California buckwheat (Eriogonum fasciculatum)
- Coast brittle-bush (Encelia californica)
- Golden yarrow (Eriophyllum confertifolium)
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:
- Northern Coastal Scrub and Coastal Prairie, which lies in San Luis Obispo to Oregon.
- Coastal Sage scrub, which lies in San Diego to Monterey.
- Maritime Succulent Scrub, which can be found in the San Diego County to Baja California.
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 (Taxicodendron 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), Black sage (Salvia mellifera), California buckwheat (Eriogonoum fasciculatum), and 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
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
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.
- Southern California
The metropolitan areas of Los Angeles, San Diego, and Tijuana are located in the southern coastal scrublands, and most of the scrublands have been lost to urbanization and agriculture. The plants of this community prefer the mild maritime climates found along Southern California's coastline. World Wildlife Fund estimates that only 15 percent of the coastal sage scrublands remain undeveloped. Some of the remaining southern coastal scrub in Los Angeles County can be found in dunes under the takeoff path at Los Angeles International Airport—LAX, in the coastal Santa Monica Mountains National Recreation Area, and at the Robert J. Bernard Field Station at the Claremont Colleges. In San Diego County, the Camp Pendleton Marine Corps Base protects larger areas, and the Marine Corps Air Station Miramar has vernal pools and the endemic mint Pogogyne abramsii. One of the largest remaining areas of inland coastal sage scrub is found in the Temescal Mountains of Riverside County.
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.
- "C. Michael Hogan (2008) Torrey Pine: Pinus torreyana, Globaltwitcher.com, ed. Nicklas Stromberg". Archived from the original on 2009-04-25. Retrieved 2008-09-26.
- In: Mayer KE and Laudenslayer WF. A Guide to Wildlife Habitats of California. Sacramento, CA: California Department of Fish and Game; "Coastal Scrub"; de Becker, Sally. (1988).
- Schoenherr, Allan A. (1992). A Natural History of California. Berkeley, CA: University of California Press.
- "California coastal sage scrub and chaparral". Terrestrial Ecoregions. World Wildlife Fund.
- National Park Service: Coastal Sage Scrub and Southern Maritime Chaparral Communities
- Santa Barbara College, Biology Dept: "Soft Chaparral or Coastal Sage Scrub Community"
- Calflora Database — Southern California Plant Communities — see #4. Coastal sage scrub.
- Claremont Colleges: Robert J. Bernard Field Station website — Lists and photographs of organisms found in Coastal sage scrub.
- Las Pilitas horticulture database: California coastal sage scrub plant community — text, images, species links.
- Theodore Payne Foundation for Wild Flowers and Native Plants: Native Plant Guides — Southern California species.