SPECIES: Ceanothus cuneatus
© Michael W. Tuma
Ceanothus cuneatus var. cuneatus (buckbrush)
Ceanothus cuneatus var. fascicularis (McMinn) Hoover (sedgeleaf buckbrush) [55,58]
Ceanothus cuneatus var. rigidus (Nutt.) Hoover (Monterey ceanothus) [55,58]
Hybrids: Ceanothus distribution shares a wide range of habitats and
distributions with other Ceanothus species and is thought to hybridize
frequently [55,78]. Several hybrids are recognized in older floras.
Current floras do not recognize any of these hybrids as separate species.
FEDERAL LEGAL STATUS:
Plants database provides a distributional
map of Wedgeleaf ceanothus and its infrataxa.
FRES21 Ponderosa pine
FRES28 Western hardwoods
FRES34 Chaparral-mountain shrub
STATES/PROVINCES: (key to state/province abbreviations)
In California wedgeleaf ceanothus is the dominant shrub species in the ceanothus chaparral vegetation type. Shrub species that may associate with wedgeleaf ceanothus include chamise (Adenostoma fasciculatum), hoaryleaf ceanothus (Ceanothus crassifolius), hairy ceanothus (C. oliganthus), blueblossom (C. thyrsiflorus), Nuttall's scrub oak (Q. dumosa), toyon (Heteromeles arbutifolia), and sugar sumac (Rhus ovata) .
Chamise chaparral is the most common type of chaparral in California occurring in the north and central Coast Ranges, Sierra Nevada foothills, southern California and northern Baja mountain ranges. This type of chaparral is usually dominated by chamise, although in many stands, wedgeleaf ceanothus codominates with chamise and/or whiteleaf manzanita (Arctostaphylos viscida) . Stands where chamise and wedgeleaf ceanothus codominate are sometimes referred to as mixed chaparral. Species that associate with wedgeleaf ceanothus in this cover type include trees such as blue oak (Q. douglasii) and California buckeye (Aesculus californica), shrubs such as red shank (Adenostoma sparsifolium), Nuttall's scrub oak, birchleaf mountain-mahogany (Cercocarpus betuloides), laurel sumac (Malosma laurina), white and black sage (Salvia mellifera, S. apiana), sugar sumac, Our Lord's candle (Yucca whipplei), and herbs such as giant wildrye (Leymus condensatus), and Eastern Mojave buckwheat (Eriogonum fasciculatum) [8,18,52,74].
The most diverse community where wedgeleaf ceanothus frequently occurs in is the montane chaparral of the lower elevations and xeric sites of the Cascade, Klamath, and Siskiyou mountains of southwestern Oregon and northern California, the Transverse and Peninsular ranges of southern California, and the Sierra San Pedro Mártir of northern Baja. Habitat types in this category are foothill woodlands, and mixed coniferous forest. Generally this cover type refers to occurrences of wedgeleaf ceanothus found in the understory of transmontane forested slopes of Jeffrey pine (Pinus jeffreyi) and gray pine (P. sabiniana) in California, and Pacific ponderosa pine (P. ponderosa var. ponderosa) and oak woodlands of California and Oregon. Characteristic species that associate with wedgeleaf ceanothus in this cover type include trees such as Oregon white oak (Q. garryana), blue oak, California black oak (Q. kelloggii), California shrub live oak (Q. turbinella var. californica), valley oak (Q. lobata), leather oak (Q. durata), interior live oak (Q. wislizenii), coast live oak (Q. agrifolia), canyon live oak (Q. chrysolepis), and California buckeye. Shrubs include whiteleaf manzanita, bigberry manzanita (Arctostaphylos glauca), yerba santa (Eriodictyon californicum), eastern redbud (Cercis canadensis), pointleaf manzanita (A. pungens), Klamath plum (Prunus subcordata), California buckthorn (Frangula californica ssp. cuspidata), common snowberry (Symphoricarpos albus), Mojave ceanothus (Ceanothus greggii var. vestitus), Mohave buckbrush (C. g. var. perplexans), birchleaf mountain-mahogany, thickleaf yerba santa (E. crassifolium), flannelbush (Fremontodendron californicum), California coffeberry (Rhamnus californica), yellowleaf silktassel (Garrya flavescens), and poison-oak (Toxicodendron diversilobum) [19,30,35,52,57,71,84,96]. Also in the montane chaparral, wedgeleaf ceanothus associates with less frequented stands of Baker cypress (Cupressus bakeri) in northern California and southern Oregon [31,101], Tecate cypress (C. forbesii) in southern California and Baja [5,32], and bigcone Douglas-fir (Pseudotsuga macrocarpa) in southern California mountains . In Siskiyou County, California, and on lava flows in eastern Shasta County, California, wedgeleaf ceanothus associates with small populations of western juniper (Juniperus occidentalis) .
The coastal sage scrub habitat type is dominated by California sagebrush (Artemisia californica) and includes wedgeleaf ceanothus in areas in or near low elevation coastal aspects. Other species that may associate with wedgeleaf ceanothus in this cover type include white, black, and purple sage (Salvia leucophylla), California brittlebush (Encelia californica), eastern Mojave buckwheat, and thickleaf yerba santa [34,52,75].
In California small populations of wedgeleaf ceanothus are found on inland dune locations which have minimal soil development. Species that commonly associate with wedgeleaf ceanothus in these communities include coast live oak, chamise, California buckeye, Santa Barbara ceanothus (Ceanothus impressus), California prickly phlox (Leptodactylon californicum), and black sage .