. Chromatographic characteristics and phylogenetic relationships of "Artemisia", section "Tridentatae". Sagebrush; Chromatographic analysis; Phylogeny. Figure 39.—Photograph showing differential deer selectivity in hroiosing A. tridentata from different sources. An A. tridentata subsp. vaseyana subgroup lb is on the left and an A. tridentata subsp. tridentata subgroup lib on the In summary, wyomingensis Id and vaseyana lb are highly preferred, other vaseyana subgroups, la and Ic, are moderately preferred, and subspecies tridentata subgroups Ila, lib, and lie are lea
. Chromatographic characteristics and phylogenetic relationships of "Artemisia", section "Tridentatae". Sagebrush; Chromatographic analysis; Phylogeny. Figure 39.—Photograph showing differential deer selectivity in hroiosing A. tridentata from different sources. An A. tridentata subsp. vaseyana subgroup lb is on the left and an A. tridentata subsp. tridentata subgroup lib on the In summary, wyomingensis Id and vaseyana lb are highly preferred, other vaseyana subgroups, la and Ic, are moderately preferred, and subspecies tridentata subgroups Ila, lib, and lie are least preferred by grazing animals. Occasionally, single plants or small groups of plants within large populations of heavily grazed plants are grazed far less than the rest of the population. Several chromatographic analyses have been made when plants that possessed similar morphological characters have been found growing side by side, but one has been heavily grazed, the other ungrazed. In most instances, no important variations in chromatographic patterns were found. However, in collections of this type from lower A. tridentata subsp. vaseyana (lb) elevations, chromatograms of the ungrazed plants frequently show evidence of hybridization with A. tridentata subsp. tridentata, which may account for the difference in selectivity. Some evidence indicates that reduced brilliance of spot 9 and the appearance of spot 26 in A. nova (fig. 19) is also associated with decreased grazing preference. This apparent pattern has not been conclusively demonstrated for all sources. A similar change in chromatographic pattern was observed in A. arbuscula subsp. arbusaula (fig. 10), but no correlation could be drawn between this characteristic and utilization by game or livestock. Further observations will be required. Phylogenetio relationships . and Clements (1923) postulated the evolution of the section Tridentatae from the more primitive section Abrotanum. They further be- lieved that
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