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..
Glabrous, stems erect, assurgent, or rarely prostrate, simple, or sparingly branched, 1°-2° high. Leaves petioled; leaflets 5-9, oblong, or oblanceolate, 8"-12" long, 1 1/2-3" wide, obtusish or acute and often mucronulate at the apex, narrowed at the base, very short-stalked; peduncles terminal, elongated, bracted; spikes cylindric, 1'-4' long, 5"-6" thick; bracts awn-pointed, longer than the calyx; corolla white, 2" - 3" long; wings and keel-petals oval;.standard cordate; calyx-teeth and pod slightly pubescent.
Prairies and plains, Indiana to Minnesota, Manitoba, Tennessee, Louisiana, Texas and Colorado. June-Aug. White tassel-flower.
Petalostemon gracile var. oligophyllum Torr. Emory's Mil. Rec. 139. 1848.
Kuhnistera Candida var. occidentalis Rydberg, Contr. Nat. Herb. 3: 154. 1895.
Kuhnistera oligophylla Heller, Bull. Torr. Club 23: 122. 1896.
Glabrous, stem slender, erect or ascending, usually much branched, l°-2i° tall, the branches straight, ascending. Leaves short-petioled; leaflets about 7 (5-9), linear, linear-oblong or somewhat oblanceolate, firm, varying from less than 1" wide to 2" wide, mostly less than 10" long, or those of the lower leaves larger; spikes oblong or short-cylindric, blunt; bracts lanceolate, acuminate, equalling the calyx, or longer, deciduous; calyx-teeth usually pubescent; corolla white.
Kuhnistera multiflora Heller, Mem. Torn Club 5: 197. 1894.
Glabrous, erect, corymbosely much branched, °-2° high. Leaves short-petioled, often clustered; leaflets 3-9, linear or somewhat oblanceolate, obtuse or ob-tusish at the apex, cuneate or narrowed at the base, short-stalked, 4"-6" long, 1/4"-1" wide; peduncles elongated; heads globose, 4."-6" in diameter; bracts subulate, shorter than the calyx; calyx-teeth slightly pubescent; corolla white, about 2" long; wings and keel-petals ovate, oval, or slightly cordate.