. Chromatographic characteristics and phylogenetic relationships of "Artemisia", section "Tridentatae". Sagebrush; Chromatographic analysis; Phylogeny. Figures ZZ-34.—Repre- sentative two-dimen- sional chromatograms of methanol-soluble extracts from the leaves of putative hybrids A. tripartita X A. tridentata subsp. vaseyana subgroup la (fig. Z3) and A. tri- dentata subsp. vaseyana subgroup lb X k. tri- dentata subsp. tri- dentata subgroup lib (fig. 24). This type of introgression has wide distribution within the sagebrush populations. Collections taken from ecotones betwee
. Chromatographic characteristics and phylogenetic relationships of "Artemisia", section "Tridentatae". Sagebrush; Chromatographic analysis; Phylogeny. Figures ZZ-34.—Repre- sentative two-dimen- sional chromatograms of methanol-soluble extracts from the leaves of putative hybrids A. tripartita X A. tridentata subsp. vaseyana subgroup la (fig. Z3) and A. tri- dentata subsp. vaseyana subgroup lb X k. tri- dentata subsp. tri- dentata subgroup lib (fig. 24). This type of introgression has wide distribution within the sagebrush populations. Collections taken from ecotones between populations of different species, subspecies, or ecotypes frequently express both morphological and chromatographic evidence of interbreeding. Chromatographic evidence for hybridization between the following taxa was observed: A. tridentata subsp. vaseyana X A. tridentata subsp. tridentata; A. tridentata subsp. vaseyana X A. arbusoula subsp. arbuscula; A. tridentata subsp. vaseyana X A. nova^ A. tridentata subsp. vaseyana X A. tripartita subsp. tripartita; A. tridentata subsp. vaseyana X A. eana. subsp. visaidula; A. tridentata subsp. tridentata X A. tripartita subsp. tripartita; A. aana subsp. visaidula X A, tripartita subsp. tripartita. Examples are illustrated in figures 33 and 34. We are confident that many others will come to light as this technique is more widely applied. Ecological following observations have been made regarding the ecological distribution of the chromatographic groups of big sagebrush, primarily within the Great Basin. Collections of Group I (Artemisia tridentata subsp. vaseyana and subsp. wyomingensis) have come mostly from mountain habitats extending from the upper elevational limits of the big sagebrush zone to, and slightly beyond, the base of the foothills. Specimens of vaseyana Ic, which were all collected from the upper eleva- tions of the big sagebrush zone, appear to be widely distributed, as is evidenced by collections o
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