LEGUMINOS^. (rULSE FAMILY.) 93 



8. PETALOSTEMON, Mkhx. 



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 

 indehiscent, 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. earneum, 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. eorymbosum, Michx. Stems clustered, erect, very leafy ; leaflets 

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

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

 nate at tlie 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° liigh. Flowei-s 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. alopeeuroides, 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° liigh. 



10. AMORPHA, L. 



Calyx obconical, 5-toothcd, persistent. Vexillum straight, concave. Wings 

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

 seeded, oblong, curved, glandular-roughened, indehiscent or nearly so. — Shi-uhs, 

 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 emargjnate, sparingly dotted ; flowers racemed, blue ; calyx-teeth veiy 

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



