. Characteristics and hybridization of important intermountain shrubs. Chenopodiacae; Shrubs Great Basin. Fiauve 18.—Shaiiscai^e sai^x-uusri inter-mixed with occasional greasewood i Sarcobatus vermiculatusJ on west side of Sanvete Valley, Sanvete County, Utah. Filled utricles have been produced artificially when shadscale pollen was used to fertilize pistillate plants of fourwing saltbush. Of the seeds produced by this procedure, percent were viable (table 1). We hope to produce fertile hybrids between these two species. Plummer and others (1957) reported a number of natural hybrids betwee
. Characteristics and hybridization of important intermountain shrubs. Chenopodiacae; Shrubs Great Basin. Fiauve 18.—Shaiiscai^e sai^x-uusri inter-mixed with occasional greasewood i Sarcobatus vermiculatusJ on west side of Sanvete Valley, Sanvete County, Utah. Filled utricles have been produced artificially when shadscale pollen was used to fertilize pistillate plants of fourwing saltbush. Of the seeds produced by this procedure, percent were viable (table 1). We hope to produce fertile hybrids between these two species. Plummer and others (1957) reported a number of natural hybrids between shadscale saltbush and cuneate saltbush in the Colorado River drainage 16 km (10 miles) south of Emery, Utah, on Utah Highway 10. Apparently, this is a fairly common hybrid in nature and should not be difficult to produce artificially. H. C. Stutz and C. L. Pope (personal communication) of the Botany and Range Science Department of Brigham Young University have recently found shadscale occurs as a polyploid series from diploid (2n = 18) to decaploid (2n,= 90). Distribution and habitat: Shadscale occurs most often on heavier soils, although it has been found on soil containing as much as 70 percent sand. Soluble salts in these soils vary from 160 to 3,000 p/m and pH from to (Hanson 1962). Shadscale is the dominant plant on over 129,000 km^ (50,000 mi^) from Canada to Mexico at elevations from 460 to 2,135 meters (1,500 to 7,000 feet) (Hanson 1962; Branson 1966). It can be found in nearly pure stands on alkaline soils in the Great Basin and other parts of the West (Benson and Darrow 1944). Over much of its range, shadscale occurs in mixed stands with species of greasewood {Sai'cobatus') (fig. 18), sagebrush {Artemisia'), hopsage {Grayia) , rabbitbrush (Chrysothamnus) , horsebiush (Tetradymia), and juniper (Juniperus). It endures highly alkaline soils better than most of these associates and can be found growing with such halophytes as glassv\'ort iSalicomia') (Hall a
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