LEGUMINOS^E. (PULSE FAMILY.) 93 



8. PETALOSTEMON, Michx. 



Calyx nearly equally 5-toothed or 5-cleft. 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 

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

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

 heads. 



* Spikes solitary. 



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

 linear, obtuse ; spikes oval, becoming cylindrical in fruit, peduncled ; vexillum 

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

 2 long. Leaflets ' long. Flowers white. 



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

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

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

 white or reddish. 



* * Spikes corymbose. 



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

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

 ries with more numerous (11-15) oblong leaflets which are commonly emargi- 

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

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

 Stems 2 high. Flowers white. 



9. DALEA, L. 



Calyx 5-cleft. Corolla imperfectly 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-seeded, 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- 

 seedcd, oblong, curved, glandular-roughened, indehiscent or nearly so. Shrubs, 

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

 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 racemed, blue ; calyx-teeth very 

 short, nearly equal, pubescent ; legume 1 - 2-seedcd. Banks of rivers, Florida 



