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• W2000902210 abstract "Antennaria is a genus of dioecious, perennial, herbaceous Composites that are especially diverse in the cordillera of western North America. Section Alpinae consists of about nine taxa, among them A. aromatica, A. densifolia, A. media, A. pulchella, and A. umbrinella. Although diploids are morphologically distinct, the polyploid derivatives of the diploids obscure the morphological distinctness of the groups. A survey of 19 putative isozyme loci indicates that the diploids have diverged only moderately from one another with respect to biochemical genetics (I = 0.838 to 0.961). Additionally, only moderate amounts of genetic diversity were detected. Isozyme data are supportive ofa hypothesis ofa rapid mode ofspeciation inAntennaria, where morphological differentiation has been accompanied by small amounts of allozyme divergence. Polyploids have significantly higher amounts of heterozygosity than diploids and tetrasomic inheritance is inferred. Evidence from morphology and biochemical genetics suggests that the polyploids represent a continuum between interracial autopolyploids and segmental allopolyploids. In light of the relatively low degree of genetic and morphological divergence among many Antennaria species, taxonomic conservatism is advocated. ANTENNARIA Gaertner section Alpinae comprises a group of several sexually reproducing diploid-polyploid species as well as a large polyploid agamic complex. Several of the sexually reproducing species, namely A. aromatica Evert, A. densifolia A. E. Porsild, A. media Greene, A. pulchella Greene, and A. umbrinella Rydb., are related to polyploids in the A. alpina (L.) Gaertn. and A. rosea Greene agamic complexes (Bayer, 1987a). The taxonomy of this group of species has been in dispute because of morphological intergradation among several of the species. Antennaria aromatica is a recently described species (Evert, 1984) from western Montana, areas of Wyoming adjacent to Yellowstone National Park, and portions ofAlberta and British Columbia immediately adjacent to Montana (Fig. 2). It is most prevalent in the front ranges of the Rocky Mountains, where it occurs pri' Received for publication 19 May 1988; revision accepted 7 November 1988. This research was funded by grants from the Natural Sciences and Engineering Research Council of Canada (NSERC grant #s A2924 and A3797) and by a University ofAlberta Central Research Fund Grant (NSERC). Thanks go to Rob DeLuca, Mark Joncas, Klaus Lackschewitz, Dan Lebedyk, Ledyard Stebbins, and Krystyna Urbanska for accompanying me in the field on several occasions. Rob DeLuca, Mark Joncas, and Dan Lebedyk are acknowledged for their assistance in the lab. I express gratitude to Keith Denford and Doug Soltis for their careful reviews of this paper. marily on limestone talus from treeline to alpine tundra, is known from only about 30 sites, and includes diploid and tetraploid races. Antennaria umbrinella is a species of wide distribution, commonly found in the front ranges of the Rocky Mountains from Colorado to Alberta, decreasing in frequency in the western portions of its range into British Columbia, Washington, and Oregon (Fig. 1; Bayer and Stebbins, 1987). Typically a plant of lower elevations, occurring in Ponderosa woodlands and sagebrush steppe, A. umbrinella occasionally grows nearly to timberline. It is taxonomically problematic because in some areas it intergrades morphologically into A. media sensu lato (Bayer, 1 987b). Antennaria umbrinella has both diploid and tetraploid cytotypes (Bayer and Stebbins, 1987). Antennaria pulchella and A. media sensu stricto are the diploid and polyploid cytotypes respectively of A. media sensu lato (Bayer, 1987b). Antennaria pulchella is morphologically distinct from A. media sensu stricto and therefore probably should be recognized at the rank of species (Bayer, unpublished data). Additionally, A. pulchella is restricted to the alpine of the Sierra Nevada Mountains, while A. media is a widely distributed alpine species from New Mexico and Arizona north to Yukon and Alaska (Fig. 2; Bayer and Stebbins, 1987). Antennaria densifolia is an obscure species which occurs principally on the unglaciated eastern slopes ofthe Mackenzie" @default.
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• W2000902210 date "1989-05-01" @default.
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• W2000902210 title "PATTERNS OF ISOZYME VARIATION IN WESTERN NORTH AMERICAN ANTENNARIA (ASTERACEAE: INULEAE) II. DIPLOID AND POLYPLOID SPECIES OF SECTION ALPINAE" @default.
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• W2000902210 doi "https://doi.org/10.1002/j.1537-2197.1989.tb11363.x" @default.
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