. Characteristics and hybridization of important intermountain shrubs. Compositae Rocky Mountains; Shrubs Rocky Mountains; Sunflowers Great Basin; Shrubs Great Basin. Figvure 25.—Large s'peaimen of basin hig sagebrush ( Artemisia tridentata Nutt. (big sagebrush^) Big sagebrush is a highly polymorphic species with numerous ecotypes and biotypes. Three subspecies {tridentata, wyomingensisj and vaseyana) are generally recognized at the present time (Beetle 1960; Beetle and Young 1965), and will be discussed individu- ally following the general presentation of the species. Big sagebrush is comp
. Characteristics and hybridization of important intermountain shrubs. Compositae Rocky Mountains; Shrubs Rocky Mountains; Sunflowers Great Basin; Shrubs Great Basin. Figvure 25.—Large s'peaimen of basin hig sagebrush ( Artemisia tridentata Nutt. (big sagebrush^) Big sagebrush is a highly polymorphic species with numerous ecotypes and biotypes. Three subspecies {tridentata, wyomingensisj and vaseyana) are generally recognized at the present time (Beetle 1960; Beetle and Young 1965), and will be discussed individu- ally following the general presentation of the species. Big sagebrush is composed of aromatic, evergreen shrubs ranging in size from dwarf to tall, arborescent forms up to m tall [fig. 25). The lower forms generally have several main stems arising from the base, whereas the tall forms often have a single short trunk. Older branches are covered with a gray to brown or black shredded bark. Younger branches and leaves have a white to gray tomentum which gives tlie plants a silvery cast. Typical leaves are narrowly cuneate or oblanceolate and terminate with 3 blunt teeth at their truncate apexes (fig. 26). However, considcral^le variation occurs, ranging from linear, entire leaves with rounded to acute apexes to broadly cuneate leaves with varying number of teeth or shallow lobes, Tlie leaves also range in size from 2 mm to 2 cm broad and 1 cm to cm long. Normally, leaves on vegetative shoots are more characteristic and less variable than those on flowerin>' shoots. Also, per- sistent leaves, that is overwintering leaves, are less variable than leaves of the spring growth flush (Winward 1970), which are shed by midsiimiiicr. Other common names include common sagebrush and black sav^e. 26. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original McArthur, E. Durant; United States. For
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