. Characteristics and hybridization of important intermountain shrubs. Compositae Rocky Mountains; Shrubs Rocky Mountains; Sunflowers Great Basin; Shrubs Great Basin. Figure 4S.—Contrasting tephritid galls on C. nauseosus subspecies. (A.) Callus gall on ssp. albicaulis. (B.) Cotton gall on ssp. graveolens. Specimens from Gould's WashJ Washington Co.^ Utah. areas. We are currently studying the absolute specificity of these galls. In areas where these subspecies occur together the galls are very specific. We have observed only a few cases of cross gall inoculation and then only on putative hybri
. Characteristics and hybridization of important intermountain shrubs. Compositae Rocky Mountains; Shrubs Rocky Mountains; Sunflowers Great Basin; Shrubs Great Basin. Figure 4S.—Contrasting tephritid galls on C. nauseosus subspecies. (A.) Callus gall on ssp. albicaulis. (B.) Cotton gall on ssp. graveolens. Specimens from Gould's WashJ Washington Co.^ Utah. areas. We are currently studying the absolute specificity of these galls. In areas where these subspecies occur together the galls are very specific. We have observed only a few cases of cross gall inoculation and then only on putative hybrid plants. Wangberg (1976) independently observed some species and subspecies specificity of tephritid galls on Chrysotharmus in Idaho. Wangberg (1976) found less specificity for the round gall in Idaho than we did in Utah. He identified the tephritid flies that induce the galls as two different species of Aaiurina. nauseosus has a chromosome number of 2n = 18 (Anderson 1966, 1971; Kovanda 1972; Anderson and others 1974). This rabbitbrush is a highly variable species of numerous ecotypes and biotypes from which a large number of segregates have been described. Most important among these, in the Great Basin at least, are the subspecies: salicifolius^ albicaulis^ graveolens^ and aonsimilis. Other less common and less important subspecies include: junceus^ gnaphalodes^ holo- leuGus, leiospermuSj and turbinaturs. L. C. Anderson (letter 4/12/72) advised using C. nauseosus in hybridization pro- grams since all the natural Chrysotharmus hybrids he had found involved this species. Anderson has found hybrids of C. nauseosus ssp. nauseosus X C. parryi ssp. parryi^ C. albidus X C. nauseosus^ and C. nauseosus ssp. albicaulis X Haplopappus macronema. The last named combination is the putative parentage of the rare endemic C. bolanderi (Anderson and Reveal 1966). In 1966 there were only 25-50 plants of this species--all at Mono Pass, California. In his artifici
Size: 1891px × 1321px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookcollectionameri, bookcollectionbiodiversity
