. Characteristics and hybridization of important intermountain shrubs. Compositae Rocky Mountains; Shrubs Rocky Mountains; Sunflowers Great Basin; Shrubs Great Basin. Figure 16.—Four-year-old transplants of black sagebrush (A. novaJj lefts <2"<i basin big sagebrush (k. tridentata ssp. tridentatajj right. Specimens growing at an ada:ptation plot near Ephraim, Sanpete Co., Utah. The principal difference between black sagebrush and low sagebrush is that low sagebrush has 5 to 11 flowers per head, 10 to 15 canescent involucral bracts, and is light in color. Black sagebrush has fewer flo
. Characteristics and hybridization of important intermountain shrubs. Compositae Rocky Mountains; Shrubs Rocky Mountains; Sunflowers Great Basin; Shrubs Great Basin. Figure 16.—Four-year-old transplants of black sagebrush (A. novaJj lefts <2"<i basin big sagebrush (k. tridentata ssp. tridentatajj right. Specimens growing at an ada:ptation plot near Ephraim, Sanpete Co., Utah. The principal difference between black sagebrush and low sagebrush is that low sagebrush has 5 to 11 flowers per head, 10 to 15 canescent involucral bracts, and is light in color. Black sagebrush has fewer flowers per head (3 to 5), 8 to 12 glabrous involucral bracts, and is usually darker in color. Also, the flower stalks of black sagebrush are denser, much darker, and more persistent than those of low sagebrush (Ward 1953). Black sagebrush flowers from August to mid-September, and seeds mature in October and November. Cleaned seed averages 2,000 per gram (907,000 per pound) (Plummer and others 1968). Insect galls are numerous on this species, but rust diseases are less common (Beetle 1960). diploid (2n = 18) and tetraploid (2n = 36) forms of black sagebrush have been found (Ward 1953; McArthur and Plummer 1978). Beetle (1960) has found evidence of A. nova hybridizing with A. bigelovii, A. tridentata ssp. tridentata, and A. tridentata ssp. vaseyana. Crossing between black sagebrush and basin big sage- brush is fairly common wherever they occur together. The cross with mountain big. Figure 17.—Black sage- brush (A. nova) growing in shallow, stony soil at Clay Bills Mesa, San Juan Co., Utah. 18. 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. Forest Service. cn. Ogden, Utah : Intermountain Forest and Range Experiment Station, Forest Service, U. S. Dept.
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