FABACEAE. 



Vol. II. 



4. Petalostemum multiflorum Nutt. Round- 

 headed Prairie-clover. Fig. 2515. 



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



Kuhnistera multiflora Heller, Mem. Torr. Club 5: 197. 

 1894. 



Glabrous, erect, corymbosely much branched, i°-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, i"-i" 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, 



5. Petalostemum purpureum (Vent.) Rydb. 

 Violet or Purple Prairie-clover. Fig. 2516. 



Dalea purpurea Vent. Hort. Cels, pi. 40. 1800. 

 Petalostemon violacemn Michx. Fl. Bor. Am. 2 : 50. 1803. 

 Dalea violacea Willd. Sp. PI. 3: 1337. 1803. 

 Kuhnistera purpurea MacM. Met. Minn. 329. 1892. 

 P. purpureum Rydb. Mem. N. Y. Bot. Gard. i : 238. 1900. 



Glabrous or slightly pubescent, erect, li'-s" high, 

 branching above. Leaves short-petioled, more or less 

 clustered ; leaflets 3-5, narrowly linear, 3"-9" long, 

 ¥'-i" wide, acutish and often mucronate at the apex, 

 narrowed at the base, very short-stalked; spikes pe- 

 duncled, oblong, or finally cylindric, ¥-2' long, about 

 5" thick ; bracts obovate, mucronate, nearly glabrous, 

 equalling the silky-pubescent calyx or shorter ; corolla 

 violet or purple, about 2" long; standard cordate; 

 wings and keel-petals oblong. 



Prairies and plains, Indiana to Manitoba, Saskatche- 

 wan, Texas and Colorado. Often grows with P. can- 

 didum. July-Aug. Thimbleweed. Red tassel-flower. 



6. Petalostemumtenuifolium A. Gray. Silky 

 Prairie-clover. Fig. 2517. 



P. tenuif alius A. Gray, Proc. Am. Acad. 11 : 73. 1876. 

 Kuhnistera tenuifolia Kuntze, Rev. Gen. PI. 192. 1891. 



More or less pubescent, erect, branching, i°-2° 

 high. Leaves short-petioled; leaflets 3-5, linear, ob- 

 tuse, somewhat involute, dotted with sessile glands, 

 3"-S" long, i"-l" wide, very short-stalked or sessile ; 

 peduncles terminal, elongated, bracted ; spikes ob- 

 long or cyhndric, ¥-i¥ long, about 5" thick, the 

 rachis pubescent; flowers rose-purple, about 2-i" 

 long ; bracts ovate, aristate, silky-pubescent, slightly 

 exceeding the very silky-pubescent calyx; standard 

 nearly orbicular, cordate, cucullate. 



In dry soil, Kansas and Arkansas to New Mexico. 

 July-Aug. 



