Astragalus sulphurescens Rydb.
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Authority
New York Botanical Garden. Herbarium of Dr. Per Axel Rydberg. Purchased, 1899. Contributions from the New York Botanical Garden.
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Family
Fabaceae
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Scientific Name
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Description
Species Description - A light green cespitose perennial. Stems ascending, about 4 dm. high, angled, glabrous, somewhat branched: stipules ovate to lanceolate, membranaceous, free from the petioles: leaflets 13-19, elliptic, obtuse or acutish, mucronulate, 12-30 mm. long, with a few scattered strigose hairs: spike dense and elongated: flowers ascending: bracts lanceolate-subulate, about 8 mm. long: calyx white-strigose with scattered black hairs: tube about 5 mm. long: lobes almost filiform, fully 5 mm. long: corolla light yellow: banner narrow, 15-18 mm. long, much exceeding the wings and keel: wings very narrow, only about 1.5 mm. wide: pod 2-celled, with dorsal suture deeply inflexed, deeply obcordate in section, about 1 cm. long, 3-4 mm. wide, strigose, with black hairs.
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Discussion
This species is closely related to A. adsiirgens, but differs in the yellow, ascending flowers, narrow petals, more scant pubescence, the long slender calyx lobes and the black hairy pod. It grows at an altitude of 1600-3000 m.
Colorado: Georgetown, 1895, P. A. Rydberg (type); along Platte River, Denver, 1878, M. E. Jones, 851.
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Distribution
Colorado
Colorado United States of America North America|