. Caratteristiche di ibridazione e di importanti intermountain arbusti. Compositae Montagne Rocciose; arbusti Montagne Rocciose; Girasoli Grande Bacino; arbusti Grande Bacino. Figura 30.-due anche in età piante rappresentanti eaotypes del grande bacino sagebrush (A. purshia ssp. tridentataj crescente presso il campo di neve stazione. Il modulo a sinistra è stata trans- piantati da Paradise Valley, Humboldt Co., Nevada; quello di destra è stato trapiantato dal Jackson montagne, Humboldt Co., Nevada. Il righello in centro primo piano è di 30 am lungo.. pannocchie. Le teste contengono da 3 a 6 piccole o giallastro, brunastro tr

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. Characteristics and hybridization of important intermountain shrubs. Compositae Rocky Mountains; Shrubs Rocky Mountains; Sunflowers Great Basin; Shrubs Great Basin. Figure 30.—Two even-aged plants representing eaotypes of basin big sagebrush (A. tridentata ssp. tridentataj growing at the Snow Field Station. The form on the left was trans- planted from Paradise Valley, Humboldt Co., Nevada; the one on the right was transplanted from the Jackson Mountains, Humboldt Co., Nevada. The ruler in the center foreground is 30 am long.. panicles. The heads contain 3 to 6 small yellowish or brownish, trumpet-shaped, perfect-disc flowers. The narrowly campanulate involucre consists of canescent bracts 3 to 4 mm long and about 2 mm wide that form 4 to 5 overlapping series around each head. The outermost bracts are less than a fourth as long as the innermost bracts. Flowering occurs from late August to October. Seed matures depending on site from October to November. Basin big sagebrush is probably the most abundant shrub in western North America on lowland ranges. It normally occurs on dry, deep, well-drained soils on plains, valleys, and foothills below 2, 130 meters (7, 000 feet) elevation. Above this elevation, subspecies vaseyana and occasionally subspecies wyomingensis are more preva- lent. Vigorously growing basin big sagebrush is considered indicative of productive ranges because it often grows in deep, fertile soil. This subspecies has generally been regarded as intolerant of alkali, but there are ecotypes that grow in relatively high alkalinity in association with such alkali-tolerant plants as black greasewood, shad- scale saltbush, and saltgrass (Distichlis stricta). Plants with strikingly reflexed drooping branches of inflorescence are found throughout the range of subspecies triden- tata. These have been termed A. tridentata ssp. tridentata f. parishii (Beetle 1959). This form may be environmentally induced because some ssp. vaseyana populations of central Nevada a

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• bookcentury1900
• bookcollectionameri
• bookcollectionbiodiversity