. Characteristics and hybridization of important intermountain shrubs. Rosacea; Shrubs Rocky Mountains Region; Shrubs Great Basin. Figure ZO.—Besevt hittev- brush surrounded by blaakbrush near Motoqua, Washington County, instances. The seed has a smaller diameter-to-length ratio and is redder than antelope- bitterbrush. Desert bitterbrush averages 20,800 cleaned seeds per pound (46/g) (Plummer and others 1968). In Utah, flowers bloom in May with the fruit ripening by mid-July at lower eleva- tions and by mid-August at higher elevations. Blooming and seed maturity occur earlier on more s
. Characteristics and hybridization of important intermountain shrubs. Rosacea; Shrubs Rocky Mountains Region; Shrubs Great Basin. Figure ZO.—Besevt hittev- brush surrounded by blaakbrush near Motoqua, Washington County, instances. The seed has a smaller diameter-to-length ratio and is redder than antelope- bitterbrush. Desert bitterbrush averages 20,800 cleaned seeds per pound (46/g) (Plummer and others 1968). In Utah, flowers bloom in May with the fruit ripening by mid-July at lower eleva- tions and by mid-August at higher elevations. Blooming and seed maturity occur earlier on more southerly ranges. However, in California, blooming has been observed as late as August at elevations of 2,740 m (9,000 feet). Hybridization: Natural hybrids between desert bitterbrusli and antelope bitterbrush or Stansbury cliffrose are common in areas where the species occur together. Stebbins [1959) reports that desert and antelope bitterbrush form such extensive hybrid swarms in eastern California where their ranges overlap that identity of their parental types is completely obliterated. Purshia glandulosa has n = 9 chromosomes ( Stutz, Professor of Botany and Range Science, Brigham Young University, Prove, Utah, personal communication). Distribution and Habitat: Desert bitterbrush is found in southern Nevada, southern California, northwestern Arizona, and southwestern Utah. It normally occurs on drier sites than antelope bitterbrush; however, there are major zones of overlap. At lower elevations in southwestern Utah, desert bitterbrush is associated with blackbrush and Stansbury cliffrose and at higher elevations, with big sagebrush, antelope bitterbrush, and Saskatoon serviceberry. Use: Desert bitterbrush is an important browse plant throughout its range. It is usually less palatable than antelope bitterbrush, but more palatable than Stansbury cliffrose (Sampson and Jespersen 1963). Desert bitterbrush readily sprouts following burning. Shoots are formed from deeply em
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