FABACEAE. 



VOL. II 



4. Parosela aurea (Nutt.) Britton. Golden 

 Parosela. Fig. 2510. 



Dalea aurea Nutt. Eraser's Cat. 1813. 



Psoralea aurea Poir. in Lam. Encycl. Suppl. 4 : 590. 

 1816. 



P. aurea Britton, Mem. Torr. Club 5 : 196. 1894. 



Erect, pubescent, simple, i-2 high. Leaflets 5-9, 

 sessile, rather distant, obovate, oblong or oblanceo- 

 late, obtuse at the apex, narrowed at the base, 4"-6" 

 long, iA"-2*" wide; spikes solitary, short-peduncled, 

 ovoid or globose, very dense, i '-3' long, 6"-8" thick; 

 bracts ovate, mucronate, shorter than the densely 

 plumose and pubescent calyx-teeth ; corolla yellow, 

 4"-S" long; standard much shorter than the wings 

 and keel. 



Prairies, South Dakota to Missouri (?), Nebraska, 

 Colorado and Texas. Summer. 



5- Parosela nana (Torr.) Heller. Low 

 Parosela. Fig. 2511. 



Dalea nana Torr.; A. Gray, Mem. Am. Acad. 4: 31. 



1849. 

 P. nana Heller, Cont. Frank. & Marsh. Coll. i : 49. 



1894. 



Suffrutescent, erect, silky-villous throughout. 

 Stems several from the same root, branched, 3'-io' 

 high; leaflets 3-5, rarely 4"-5" long, obovate to 

 linear-oblong, obtuse or mucronulate, narrowed 

 at the base, rarely glabrate above, and usually mi- 

 nutely glandular beneath ; petioles as long as the 

 leaflets ; spikes oblong-ovoid, 5"-io" long, short- 

 peduncled ; bracts ovate, mucronate or aristate, 

 shorter than the calyx, caducous ; corolla yellow, 

 longer than the setaceous and plumose calyx- 

 teeth ; standard shorter than the wings and keel. 



Sand hills and prairies, Comanche Co., Kansas, to 

 Texas and California. Summer. 



Parosela Jamesii (Torr.) Vail, with large thick 

 spikes up to 3^' long, the bracts as long as the calyx 

 or longer, the leaves 3-foliolate, ranges from Colo- 

 rado to Texas and New Mexico, and is recorded 

 from Kansas. 



19. PETALOSTEMUM Michx. Fl. Bor. Am. 2 : 48. 1803. 

 Perennial glandular-punctate herbs, with long or deep roots, odd-pinnate leaves, and pink 

 purple or white spicate or capitate flowers. Calyx-teeth nearly equal, rather broad, shorter 

 than the tube. Petals on long slender claws ; standard oblong or cordate ; wings and keel- 

 petals similar to each other, their claws adnate to the sheath of the stamen-tube almost to its 

 summit. Stamens 5, alternate with the petals. Ovary sessile, 2-ovuled; style subulate. Pod 

 included in the calyx, i-2-seeded. [Greek, referring to the united petals and stamens.] 



About 50 species, natives of North America and Mexico. Type species : Pctalostcmion cdndiditm 

 Michx. The generic name Kuhnistera Lam., used for these plants in our first edition, is better 

 restricted to its type species, K. pinnata (Walt.) Kuntze, of the Southern States, which has the 

 spikes subtended by an imbricated involucre, and long bristle-like calyx-teeth. 



* Foliage glabrous or very slightly pubescent. 

 Flowers white ; leaflets 3-9. 



Leaflets oblong, linear-oblong or oblanceolate ; spikes cylindric or oblong. i. P. compaction. 



Calyx villous-pubescent. 

 Calyx glabrous or nearly so. 



Stem little branched ; spikes cylindric ; leaflets Y 2 '-i' long, thin. 2. P. candidum. 



Stem much branched ; spikes oblong ; leaflets smaller, firm. 3. P. oli^ophyllum. 



Leaflets narrowly linear ; heads globose or short. 4. P. multiflorum. 



Flowers pink or purple. 



Leaflets 3-5 ; calyx silky-pubescent. 



Bracts glabrous ; leaflets mucronulate. 5. P.purpitrciim. 



Bracts silky-pubescent ; leaflets obtuse. 6. P. tcniiifolium. 



Leaflets 13-31 ; calyx glabrous. 7. P. foliosum. 



** Foliage silky-pubescent; leaflets 9-17. 8. P.i-illositm. 



