Monographs Details: Astragalus desperatus var. conspectus Barneby
Authors:Rupert C. Barneby
Authority: Barneby, Rupert C. 1964. Atlas of North American Astragalus. Mem. New York Bot. Gard. 13(2): 597-1188.
Description:Variety Description - Flowers longer and narrower than in var. desperatus, the banner 12.2-14.5 mm. long, 6-7.5 mm. wide; wings 11.5-13.4 mm. long, the claws 5.5-6.8 mm., the blades 6.7-8.1 mm. long, 2-2.6 mm. wide; keel-claws 5.5-7.5 mm., the blades 4.8-6. mm. long, 2.3-2.8 mm. wide; anthers 0.45-0.7 mm. long; pod 1.2-1.9 cm. long, 5-6 mm. in diameter.

Distribution and Ecology - Crevices of sandstone rimrock along canyons and on rock ledges of sandstone buttes and knolls, about 5000-5100 feet, apparently local, known only from three stations in the Colorado Basin: near Holbrook, Navajo County, and Kanab Valley, Coconino County, Arizona, and in the Little Rockies, southeastern Garfield County, Utah.—Map No. 96.—April to June.

Discussion:The var. conspectus may be recognized by its shortly racemose flowers, which are not only longer but proportionately narrower than in var. desperatus, by the cylindric calyx-tube, and uniformly pink-purple petals. At anthesis it might easily be taken for some member of sect. Argophylli, but the papery-membranous texture of the pod would be anomalous and the comparatively few ovules unusual in that section. The known stations of the variety, in two of which only about a dozen plants were seen, lie widely distant from each other, and further collections will be awaited with interest.
Distribution:Arizona United States of America North America| Utah United States of America North America|