This section is from the book "An Illustrated Flora Of The Northern United States, Canada And The British Possessions Vol2", by Nathaniel Lord Britton, Addison Brown. Also available from Amazon: An Illustrated Flora of the Northern United States, Canada and the British Possessions. 3 Volume Set..
Astragalus Drummondii Dougl.; Hook. Fl. Bor. Am. 1: 153. 1833.
Loosely woolly-pubescent, erect, 1°-2° high, rather stout, growing in clumps. Stipules ovate, long-acuminate, 3"-$" long; leaflets 19-33, oblong or sometimes oblanceolate, obtuse at the apex, narrowed at the base, 5"-10" long; flowers yellowish-white or the keel purplish tinged, 8"-9" long, in loose spikes; peduncles equalling or exceeding the leaves; pod 1-celled, the dorsal suture somewhat intruded, distinctly stipitate, cartilaginous, linear, pendent, glabrous, grooved, about 2' long; calyx somewhat enlarged at the base, dark-pubescent above.
Hills, plains and valleys, South Dakota to Nebraska, Saskatchewan, Alberta and Colorado. June-July.
Glabrous or nearly so, erect, slender, branched at the base, 9"-18' high. Stipules ovate-oblong, membranous, 2"-3" long; leaflets 7-11, oblong, obtuse or slightly emarginate at the apex, narrowed or rounded at the base, 4"-8" long; flowers white, 3"-5" long in loose short or elongated racemes; pedicels 1"-2" long; pod flattened, I-celled, oblong, short-stipitate, rather abruptly pointed at each end, membranous, finely blackish-pubescent, dehiscent, nearly straight, not furrowed, or obso-letely so, 9"-12" long.
Known only from rocky ledges of the Winooski River, Vermont; station now obliterated, and the species extinct, unless inhabiting some undiscovered locality. June-July.
Ascending or decumbent, branched from the base 6-15' high, slightly pubescent, or glabrous. Stipules ovate, folia-ceous, 2 "-3" long; leaflets 13-25, oval or elliptic, obtuse or retuse, narrowed or rounded at the base, 3"-6" long; flowers violet, the keel commonly darker, in short racemes; peduncles mostly exceeding the leaves; pod I-celled, somewhat flattened, membranous, stipitate, pendent, dehiscent, rather densely black-pubescent, oblong, acute, somewhat inflated, about 6" long, deeply furrowed on the under side; calyx dark-pubescent.