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• on the enzymatic release of HCN. Potential for poisoning is highly variable. Good growth is obtained on soils that are loams and clay loams and fair growth on sandy loams. Growth on gentle and moderate slopes is good and on steep slopes fair growth is achieved. Medium ability to control erosion may be expected. Establishment requirements are medium. Short term revegetation potential is low to medium and long term is medium to high. High potential biomass production is characteristic of this shrub. It provides fair cover for elk and good cover for the other four classes of wildlife. Good to fair forage ie provided to wildlife also. Sheet and cattle forage palatability is rated good. Energy value retention is good and protein fair. RUBBER RABBITBRUSH: CHRYSOTHAMNUS NAUSEOSUS (PALLJvS) BRI TT. • This rabbitbrush is a native preferring dry sites from 4,600 to 9,000 feet. It reproduces sexually and may fix nitrogen. It is a minor poisoner of livestock and an economic weed. Several varieties of this plant are common rangeland inhabitants. Rubber rabbitbrush has been considered toxic to stock and preliminary feeding experiments support this conclusion. This species appears to be the least palatable. Rubber rabbitbrush's growth on the topsoil reconstructive material in the Moffat Area is rated good. Growth on gentle and moderate elopes is good and growth is fair on steep areas. Erosion control is rated medium. Establishment requirements are low. This plant is rated low for short term revegetation potential and medium to high for long terms. Potential biomass production for this rabbitbrush is medium. Good cover is provided for deer, game birds, small non-game birds and small • mammals. Cover for elk is fair. Forage value is good for deer and elk and feir for the other three classes of wildlife. Forage palatability Mid-term '94 4.4-A-29 September 15,1994