Treesearch

The genus Heteromeles has only a single species - H. arbutifolia (Lindl.) M. Roemer, also known as H. salicifolia (K. Presl.) Abrams (Phipps 1992). It is closely related to the large tropical genus Photinia Lindl., to which it has sometimes been referred. Christmasberry, also known as toyon, California holly, and hollywood, is a long-lived shrub or small tree, 2 to 10 m in height, that sprouts freely after fire from a subterranean burl. It has shiny, leathery, evergreen leaves that are sharply toothed along the margins. A common constituent of chaparral vegetation throughout California and...

Common seabuckthorn - Hippophae rhamnoides L. - is native to northwestern Europe through central Asia to the Altai Mountains, western and northern China, and the northern Himalayas. Of the 2 species in the genus, only common seabuckthorn is widely cultivated (Rehder 1940). A very hardy deciduous shrub or a small tree, common seabuckthorn is used primarily for ornamental purposes. In Europe and Asia, it is used to form hedges and, because of its nitrogen- fixing symbionts, serves to enrich and protect soils (Bogdon and Untaru 1967; Kao 1964; Stewart and Pearson 1967). A tendency to form...

Two varieties of this species - Chamaebatia foliolosa Benth. - are recognized. The typical variety, bearmat, is an evergreen shrub, 15 to 60 cm tall, that grows between 600 and 2,100 m elevation on the western slopes of the Sierra Nevada in California. It occurs in open ponderosa pine (Pinus ponderosa Dougl. ex Laws.) and in California red fir (Abies magnifica A. Murr.) forests (Munz and Keck 1963). Southern bearmat - C. foliolosa var. australis Brandg. - grows to a height of nearly 2 m on dry slopes in the chaparral type from San Diego County to Baja California.

Fernbush - Chamaebatiaria millefolium (Torr.) Maxim. - the only species in its genus, is endemic to the Great Basin, Colorado Plateau, and adjacent areas of the western United States. It is an upright, generally multistemmed, sweetly aromatic shrub 0.3 to 2 m tall. Bark of young branches is brown and becomes smooth and gray with age. Leaves are leathery, alternate, simple, bipinnatisect, stipulate, and more or less clustered near the ends of the branches. Foliage and young branches are viscid and pubescent, with simple and stellate hairs that are sharp-pointed or glandular-capitate....

Members of the rabbitbrush genus - Chrysothamnus spp. - are among the best-known of western shrubs (Johnson 1987; McArthur and Welch 1986; McArthur and others 2004, 1979). The genus is endemic to western North America and is made up of 16 species (Anderson 1986; McArthur and Meyer 1987). It has recently been partially subsumed under the new genus Ericameria, formerly an infraspecific taxon within the related genus Haplopappus (Anderson 1995; USDA NRCS 2001). Because the durability of this nomenclatural change has yet to be demonstrated, the decision here is to follow the traditional...

Blackbrush - Coleogyne ramosissima Torr. - grows in the transition zone between warm and cold deserts of southern California, southern Nevada, southern Utah, northern Arizona, and southwestern Colorado. It is found at elevations of 760 to 1,980 m. Ranging from 0.3 to 1.2 m in height, blackbrush forms almost monotypic stands in the lower Mojave-Great Basin ecotone, bounded by creosote bush (Larrea tridentata (Sesse & Moc.) ex DC. Coville.) communities at low elevations and by juniper-big sagebrush (Artemesia tridentata Nutt.) communities at higher elevations. In the eastern part of its...

The currant and gooseberry genus - Ribes - includes about 150 species of deciduous, (rarely) evergreen, shrubs that grow in the colder and temperate parts of North America, Europe, Asia, and South America. The unarmed species are commonly called currants; the prickly species are gooseberries. Of the more important species for which seed data are available, 16 are native to the United States and 1 was introduced from Europe (table 1). These species generally occur as rather low-growing shrubs, although 3 species can attain heights of 3 to 4 m (table 2).

The genus Cotoneaster includes about 50 species of shrubs and small trees native to the temperate regions of Europe, northern Africa, and Asia (excepting Japan) (Cumming 1960). Growth habits range from nearly prostrate to upright. Coldhardy types are more or less deciduous, whereas those native to warmer regions are evergreen (Heriteau 1990). Cotoneasters are valued as ornamentals for their glossy green foliage, attractive fruits, and interesting growth habits. Fall foliage color is often a showy blend of orange and red. Cotoneasters are adapted to sunny locations with moderately deep and...

Ceratonia siliqua L. - carob, St. John's bread, or locust - is a small to medium-sized broadleaf, evergreen tree that may grow to 20 m in height under ideal climatic conditions (Catarino 1993) but usually reaches heights of 8 to 15 m (Goor and Barney 1968). Carob is thought to be a tropical plant that has adapted well to Mediterranean climates by utilizing its deep rooting habit and xerophilous leaves to avoid water stress (Catarino 1993). The deep taproot's penetration into moist regions of the soil profile effectively lengthens the active growth period for carob leaves during the...

Siberian peashrub - Caragana arborescens Lam. - is one of the most hardy small deciduous trees or shrubs planted on the northern Great Plains (George 1953; Rehder 1940). Introduced into North America in 1752 (Rehder 1940), Siberian peashrub is native to Siberia and Manchuria and occurs from southern Russia to China (Graham 1941). Varieties include the dwarf (C. a. nana Jaeg.) and Lorberg (C. a. pendula Carr.) peashrubs (Kelsey and Dayton 1942). The species readily adapts to sandy, alkaline soil and open, unshaded sites on the northern Great Plains, where it grows to heights of 7 m. It has...