. Chromatographic characteristics and phylogenetic relationships of "Artemisia", section "Tridentatae". Sagebrush; Chromatographic analysis; Phylogeny. Chemotaxonomic methods have recently been used to study taxa within the Tridenta- tae. Chromatographic investigations by Holbo and Mozingo (1965), Young (1965) , Winward and Tisdale (1969), Hanks and others (1971), and Brunner (1972) give support to the taxonomic treatment of species and subspecies by Hall and Clements (1923) and Beetle (Beetle 1960; Beetle and Young 1965). Identification and distribution of leaf phenols, se
. Chromatographic characteristics and phylogenetic relationships of "Artemisia", section "Tridentatae". Sagebrush; Chromatographic analysis; Phylogeny. Chemotaxonomic methods have recently been used to study taxa within the Tridenta- tae. Chromatographic investigations by Holbo and Mozingo (1965), Young (1965) , Winward and Tisdale (1969), Hanks and others (1971), and Brunner (1972) give support to the taxonomic treatment of species and subspecies by Hall and Clements (1923) and Beetle (Beetle 1960; Beetle and Young 1965). Identification and distribution of leaf phenols, sesquiterpene lactones, and alkanes are proving to be of value in delimitating Artemisia species (Shafizadeh and Melnikoff 1970; Shafizadeh and others 1971; Bachelor and others 1972). Our special interest in sagebrush arose primarily from questions as to why game and livestock exhibited marked preferences for certain big sagebrush populations (Brunner 1972) or for certain individuals in a population (fig. 1). In earlier chromatographic work (Hanks and others 1971; Hanks and Jorgensen 1973), we reported evidence for and means of detecting some of these differences in subspecies of big sagebrush (Artemisia tridentata subsp. tridentata and A. tvidentata subsp. vaseyana). In the course of this research, chromatographic analyses were done on other species in the Tridentatae as well. This paper stresses some considerable differences discovered among these species through chromatographic studies in 1969 and 1972, and outlines phylogenetic relationships among these species as suggested by chromatographic patterns. Other chromatographic analyses have been performed in the Tridentatae; however, this study is much broader in scope and builds on earlier work. The large amount of genetic variation in natural populations of Artemisia provides wide opportunity for the development of improved races through artificial selection and breeding. Chromatography offers a rapid means of verifying the ex
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