LEGUMINOSJE. (rULSE FAMILY.) 93 



8. PETALOSTEMON, Michx. 



Calyx nearly equally rj-tootlicd or 5-eleft. 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 deft tube. Ovary 2-ovuled. Legume 



indchiseent, 1 -seeded, included in the calyx. — Pci-cnnial glandular herbs, with 



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



heads. 



* Spikes solitary. 



1. P. gracile, Xutt. 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 i' 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. 



* * Spilres conjmhose. 



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

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

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

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

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

 Stems 2° high. Flowers white. 



9. DALE A, L. 



Calyx 5-ckft. Corolla imperfectly pr.pilion;u'Coas ; petal.-; clawed; frar of 

 them united with the tube of stamens below tlie middle, the fifth (vexir.uii;) free, 

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

 cleft tube. Legume 1-seeded, membranaceous, indchiseent, included in tlie calyx. 

 — Mostly glandular herbs, with spiked or capitate flowers. 



1. D. alopecuroides, WilUl. 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-toothcd, persistent. Vexillum straight, concave. "Wings 

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

 seeded, oblong, curved, glandular- roughened, indchiseent 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. frutieosa, L. Pubescent; leaves petioled ; leaflets 15-21, oblong, 

 obtuse or emarginate, sparingly dotted ; flowers raeemed, blue ; calyx-tcetb very 

 short, nearly equal, pubescent; logiune I-2-sceded. — Banks of rivers, Florida 



