. Characteristics and hybridization of important intermountain shrubs. Compositae Rocky Mountains; Shrubs Rocky Mountains; Sunflowers Great Basin; Shrubs Great Basin. Figure 8.—Bigelow sage- brush (k. bigeloviij growing with fourwing saltbush fAtriplex canescensj in a grav- elly draw near Bicknelly Wayne Utah. A. bigelovii is normally free of insect galls and rust diseases that are common in the other taxa of the section Tridentatae (Beetle 1960). species has a basic chromosome number of ^=9. Both diploid (2n = 18) and tetraploid (2n = 36) forms are known (Ward 1953;
. Characteristics and hybridization of important intermountain shrubs. Compositae Rocky Mountains; Shrubs Rocky Mountains; Sunflowers Great Basin; Shrubs Great Basin. Figure 8.—Bigelow sage- brush (k. bigeloviij growing with fourwing saltbush fAtriplex canescensj in a grav- elly draw near Bicknelly Wayne Utah. A. bigelovii is normally free of insect galls and rust diseases that are common in the other taxa of the section Tridentatae (Beetle 1960). species has a basic chromosome number of ^=9. Both diploid (2n = 18) and tetraploid (2n = 36) forms are known (Ward 1953; McArthur and Plummer 1978). Bigelow sagebrush and basin big sagebrush are often found growing together but are not known to cross or intergrade. Distribution and sagebrush has a more southerly distribution than other sagebrushes. It is one of the most drought-resistant sagebrushes. It occurs over approximately 8,810,000 hectares (34,010 square miles) through western Texas, southern Colorado, New Mexico, Arizona, Utah, Nevada, and California in canyons, gravelly draws and dry flats from 900 to 2,400 meters (3,000 to 7,900 feet) (Ward 1953; Beetle 1960; Kearney and Peebles 1960) (fig. 8). The Bigelow sagebrush type locality is recorded as "rocks and canyons on the Upper Canadian, Texas" (Beetle 1960). This species is often found mixed with big sagebrush, black sagebrush, leafless green rabbitbrush {Chrysotharmus nauseosus ssp. junceus), shadscale [Atriplex oonferti- folia), and especially matchbrush [Xanthocephalum [Gutierrezia] sarothrae) (Hall and Clements 1923). sagebrush is palatable to livestock and game in all areas where it occurs. Its twigs are less woody, its odor milder, and its taste is less bitter than most of the big sagebrush complex (Hall and Clements 1923). Artemisia cana Pursh. (silver sagebrush^) Silver sagebrush is an erect, freely branched, rounded shrub up to meters tall. Older branches have dark-brown, fibrous
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