George W. Argus

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During the period 1970-1974, the U.S. Tundra Biome Program, which was stationed primarily out of Barrow, performed a series of environmental and terrestrial ecological studies at Prudhoe Bay. This volume reports specifically on the Prudhoe results and is divided into three major subdivisions: (1) abiotic and soil investigations; (2) plant investigations,(More)
The taxonomy and systematics of Salix subgenus Salix s.l. is difficult. The reliability and evolutionary implications of two important morphological characters (number of stamens, and morphology of bud scales) used in subgeneric classification within Salix remain untested, and a disjunct Old–New World distribution pattern of a main clade of subgenus Salix(More)
Willows (Salix: Salicaceae) form a major ecological component of Holarctic floras and consequently are an obvious target for a DNA-based identification system. We surveyed two to seven plastid genome regions (~3.8 kb; ~3% of the genome) from 71 Salix species across all five subgenera, to assess their performance as DNA barcode markers. Although Salix has a(More)
Salix L. is the largest genus in the family Salicaceae (450 species). Several classifications have been published, but taxonomic subdivision has been under continuous revision. Our goal is to establish the phylogenetic structure of the genus using molecular data on all American willows, using three DNA markers. This complete phylogeny of American willows(More)
Salix taxifolia s.1., originally described as two species, has been treated as either a single species, or as two varieties: var.taxifolia and var.microphylla. Morphological, chemical, and phytogeographical evidence supports treatingSalix taxifolia andS. microphylla as species. These taxa are distinguished on the basis of leaf length, leaf length-width(More)
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