LEGUMINOS^. (rULSE FAMILY.) - 93 



8. PETALOSTEMON, Michx. 



Calyx nearly equally 5-tootlied or 5-ck'tt. Petals almost regular, on filiform 

 claws, four of them united with the tube of stamens, the fifth free, cordate or 

 oblong, folded. Stamens 5, united into a cleft tube. Ovary 2-ovuled. Legume 

 indehiscent, 1-seeded, included in the calyx. — Perennial glandular herbs, with 

 unequally pinnate leaves, and white or purple flowers iu terminal spikes or 



heads. 



* Spikes soUtarij. 



1. P. gracile, Nutt. Stems decumbent, virgate; leaflets 5-7, oblong- 

 linear, obtuse ; spikes oval, becoming cylindrical in fruit, peduncled ; vcxil'.uni 

 broadly cordate — Low pine barrens, Florida and westward. August. — Stems 

 2° long. Leaflets j' long. Flowers white. 



2. P. carneum, Michx. Stems erect, much branched, very leafy ; leaf- 

 lets 5-7, linear, acute ; spikes oblong, long-pcduncled ; vexillum oblong. — Dry 

 sandy soil. Florida and Georgia, westward. — Stems 2° - 3° high. Flowers 

 white or reddish. 



* * Spikes corymliose. 



3. P. corymbosum, Michx. Stems clustered, erect, very leafy ; leaflets 

 3-7, filiform; teeth of -the calyx setaceous, plumose ; vexillum oblong. — Va- 

 ries with moi-e numerous (11-15) oblong leaflets which are commonly cmargi- 

 nate at the apex. — Dry pine barrens, Florida to North Carolina, and westward ; 

 the variety in the low country of Soutii Carolina, Curtis. Sept. and Oct. — 

 Stems 2° high. Flowers white. 



9. DALEA, L. 



Calyx 5-cleft. Corolla imperfectl}' papilionaceous ; petals clawed ; four of 

 them united with the tube of stamens below the middle, the fifth (vexillum) free, 

 cordate, and inserted into the bottom of the calyx. Stamens 10, united into a 

 cleft tube. Legume 1-secded, membranaceous, indehiscent, included in the calyx. 

 — Mostly glandular herbs, with spiked or capitate flowers. 



1. D. alopecuroides, Willd. Stem erect, smooth ; leaves pinnate, with 

 numerous linear-oblong leaflets ; spikes dense, cylindrical, silky-villous ; corolla 

 small, pale violet, the vexillum white. — Rich soil, Alabama, northward and 

 westward. July. — Stem l°-2° high. 



10. AMORPHA, L. 



Calyx obconical, 5-toothed, persistent. Vexillum straight, concave. "Wings 

 and keel none. Stamens monadelphous at the base, exserted. Legume 1-2- 

 seeded, ol)long, curved, glandular-roughened, indehiscent or nearly so. — Shrubs, 

 with unequally pinnate leaves, and numerous leaflets which are punctate witii 

 pellucid dots. Flowers blue or white, in slender racemes or spikes. 



1. A. fruticosa, L. Pubescent; leaves petioled ; leaflets 15-21, oblong, 

 obtuse or emarginate, sparingly dotted ; flowers racemcd, blue ; calyx-teeth very 

 short, nearly equal, pubescent; legume l-2sceded. — Banks of rivers, Florida 



