Astragalus hyalinus var. hyalinus
Astragalus sect. Orophaca
obscured by stipules and leaf bases.
trifoliolate or unifoliolate, leaflets caducous when dried, petiolate.
reduced to 1–3 flowers, flowers erect, ± sessile in leaf axils.
petals usually white, conspicuously villose adaxially;
ovules 8 or 9.
usually whitish to ochroleucous, rarely purple, banner nearly erect, little recurved, keel apex bluntly triangular or obtuse.
tubes cylindric.
often concealed by stipules, deciduous, sessile, erect, at first enclosed by calyx, finally rupturing tube, subsymmetrically ovoid-ellipsoid or narrowly ellipsoid, laterally compressed, straight or slightly decurved, unilocular.
8–17.
malpighian.
connate-sheathing.
Astragalus hyalinus var. hyalinus
Astragalus sect. Orophaca
Variety hyalinus occurs from southeastern Montana through eastern Wyoming to southwestern South Dakota, western Nebraska, northwestern Kansas, and northeastern Colorado. It was also reported for North Dakota by Ced. L. Porter (1951).
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Species 3 (3 in the flora).
Section Orophaca is distributed from southern Alberta to southwestern Manitoba southward to Wyoming, northeastern Colorado, and northeastern Utah. The case was made by D. Isely (1983) for assignment of the species placed here in sect. Sericoleuci and sect. Orophaca to the genus Orophaca. One consideration was the lack of any near relatives among the vast number of Astragalus species in North America, and another was the base chromosome number of 12 in Orophaca, not 11–15 as for members of Astragalus.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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