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• W2501311591 abstract "The taxonomie and geographic limits of Silene suksdorfii, S. grayi, and S. sargenta are not well defined in California. Specimens of Silene from subalpine and alpine regions have been regarded traditionally as either S. grayi or S. sargentii. Several collections from northern California possess features characteristic of S. suksdorfii. Evidence from morphological, ecogeographical, and phytochemical examinations is presented that clarifies the taxonomie relationships, delimits the differences among these species, and corroborates the existence of S. suksdorfii in California. Silene has been the subject of several regional and worldwide taxonomie revisions (Williams 1896, Robinson 1897, Hitchcock and Maguire 1947, Chowdhuri 1957). Although many species are circumscribed clearly, others are polymorphic or possess characters that do not permit clear distinctions to be made, and information about the distribution and habitat(s) of these species often is lacking or defined poorly. Historically, subalpine and alpine specimens of Silene from the southern Cascade Range of California have been considered to be either S. grayi Wats, or S. sargentii Wats. The occurrence of S. suksdorfii Robins, on Mount Shasta has been overlooked generally, and examination of herbarium records and pertinent literature indicates that the distributional ranges of these three species are not well understood. Robinson (1891), Hitchcock and Maguire (1947), and Chowdhuri (1957) commented on the similar morphology of S. suksdorfii , S. grayi , and S. sargentii. Traits that typically distinguish S. suksdorfii from S. grayi and S. sargentii are its shorter stature, shorter basal leaves, bilobed petal blades, and trichomes of the calyx that possess purple septal walls. Silene suksdorfii is differentiated further from S. grayi by the presence of anastomosing calyx veins, and from S. sargentii by epapillose seeds. Hybridization studies by Kruckeberg (1955, 1961) showed that S. suskdorfiU S. grayi, and S. sargentii are distinct species. Kruckeberg (1955) ascribed the high degree of sterility in hybrids to meiotic abnormalities during microspore formation and observed little chromosome pairing in hybrids. Kruckeberg (1961) concluded that vegetative and reproductive features showed that extensive genetic difMadrono, Vol. 34, No. 1, pp. 29-40, 1987 This content downloaded from 40.77.167.23 on Tue, 07 Jun 2016 05:23:39 UTC All use subject to http://about.jstor.org/terms" @default.
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• W2501311591 title "A systematic study of Silene suksdorfii, S. grayi, and S. sargentii (Caryophyllaceae)" @default.
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