2. Petalostemum Cándidum (Willd.) Michx. White Prairie-Clover

Fig. 2513

Dalea Candida Willd. Sp. Pl. 3: 1337. 1803. P. candidum Michx. Fl. Bor. Am. 2: 49. 1803. Kuhnistera Candida Kuntze, Rev. Gen. Pl. 192. 1891.

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.

3. Petalostemum Oligophýllum Torr. Slender White Prairie-Clover

Fig. 2514

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.

Petalostemon oligophyllum Torr.; Smyth, Trans. Kans. Acad. 15: 61. 1898.

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.

Plains, South Dakota to Nebraska, Wyoming, Texas, Arizona and Mexico. Root sometimes over 1° long. June-Sept.

3 Petalostemum Oligoph Llum Torr Slender White Pra 8563 Petalostemum Oligoph Llum Torr Slender White Pra 857

4. Petalostemum Multiflòrum Nutt. Round-Headed Prairie-Clover

Fig. 2515

P. multiflorus Nutt. Journ. Phil. Acad. 7: 92. 1834.

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.

Plains, western Iowa to Missouri, Kansas, Arkansas and Texas. Summer.