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Show Alkali sacaton, Spgrobolus airoides Torr., is most abundant in the sandy loams giggiéégjéfines where it forms hummocks about 6 to 14 inches high. Occasionally these hummocks are joined in irregular patterns and form zones as much as 200 feet wide. It shows a similar habit of growth on some old low eroded dunes where the sand is mixed with clay and silt. During seeding it presents a striking aspect. Many grass clumps are dead in situations where undercutting of the hummocks by wind erosions is evident. has reduced it to a notable extent. In the past,drought and grazing It produces seed during periods of sufficient moisture but remaingg'dormant during unusually dry years. Squirrel's tail, Sitanion hystrix (Nutt.) Smith occurs scattered here and thereaflgis found occasionally on the foothills and sometimes on the piedmont, often around shrubs. Needle grass, §§ipa EQEEEE Trin. & Rupr., occurs widely scattered in the deeper loans of thj fipothills. Salt grass, strict; (Torr.) Rydb., XEXIEEX occurs only in a single stand along a freshwater drainage ditch established in 1952. It is common in Skull Valley and in the valleys to the west, particularly near Fish Springs where fresh water springs and drainage ways favor its growth. Introduced species of Plants. Halogeton glomeratus C. A. Mey., although only recently introduced7has become widespread and abundant especially in disturbed $3 During 1954 it was found along some roadways and occasionally extended a few feet into the native plant communities. By 1962 it extended to nearlyfi§:::%flggsturbed portion of the study area. It became very abundant on some bedding areas and areas where vehicles \ |
