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..
A. Blakei Eggleston, Bot. Gaz. 20: 271. 1895.
A. Jesupi Britton, Man. 1048. 1901.
Similar to the two preceding species, but stem rather stouter, erect or nearly so, up to 20' high, sparingly pubescent. Leaflets 9-15, oblong to elliptic, obtuse or emarginate, glabrous above, pubescent beneath; corolla whitish or bluish purple, 5"-6" long; pod 1' long or less, pubescent, swollen, somewhat triangular in section.
Astragalus distortus T. & G. Fl. N. A. 1: 333. 1838.
Sparingly pubescent or glabrate, diffuse or ascending, much branched from the base, stems 8'-15' long. Leaflets 11-25, obovate or oval, emarginate or rounded at the apex, narrowed at the base, 2"-5" long; flowers purple, 4"-6" long, in loose short spikes; pod sessile in the calyx, I-celled, slightly inflated, linear-oblong, coriaceous, strongly curved, glabrous, grooved on the under side, 1'-1 1/2' long.
In dry soil, Illinois to Iowa, south to West Virginia, Mississippi and Texas. March-July.
Astragalus lotifiorus Hook. Fl. Bor. Am. 1: 152. 1833.
Phaca lotiflora T. & G. Fl. N. A. 1: 349. 1838.
Astragalus elatiocarpus Sheld. Bull. Geol. Nat. Hist. Surv.
Minn. 9: 20. 1894. Phaca elatiocarpa Rydb. Bull. Torr. Club 32: 665. 1906. A. nebraskensis Bates, Torreya 5: 216. 1906.
Pubescent, with long white hairs, branched from the base, nearly acaulescent, or with stems 1'-3' long. Stipules ovate, acuminate, 1 1/2"-2" long; leaflets 7-15, oval or oblong, obtuse and sometimes mucronulate at the ape.-:, narrowed at the base, 5"-8" long; flowers few, yellow, 4"-6" long, in rather dense short spikes; calyx campanulate, its teeth subulate; peduncles shorter than or equalling the leaves, sometimes very short; pod I-celled, sessile, villous-pubescent, ovoid-oblong, coriaceous, somewhat inflated, pointed, dehiscent, keeled along the straight dorsal suture.