220 FLORA OF TEXAS. 



PETALOSTEMON, Michx. 



Calyx nearly equally 5-toothed or 5-cleft ; petals almost 

 regular, on filiform claws, four of them united with the 

 tube of the 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. Peren- 

 nial, glandular lierhs, with unequally pinnate leaves, and 

 white or purple /oz(;er5 in terminal spikes or heads. 



* Spikes solitary. 



P. CARNEUM, Michx. Stems erect, much branched, very 

 leafy; leaflets 5-7, linear, acute; spikes oblong, long-pe- 

 duncled; vexillum oblong. Stem 2°-3° high; floivers 

 "white or reddish. 



** Spikes corymbose. 



P. CORYMBOSUM, Michx. Ste7ns clustered, erect, very 

 leafy ; leaflets 3-7, filiform ; teeth of the calyx setaceous, 

 plumose ; vexillum oblong. Stem 2° high ; floivers white. 



P. GRACILE, Nutt. Glabrous ; stem slender, l°-2° long, 

 decumbent or assurgent; spikes oblong-cylindrical, short; 

 bracts acute, as long as the calyx ; leaflets 3 pairs, i' broad, 

 linear-elliptical, slightly dotted beneath; petals ovate; 

 vexillum broadly cordate ; petals white. — Drummond. 



P. MULTIFLORUM, Nutt. Glabrous ; stem erect, branches 

 fastigiate, about 2° high ; spikes roundish oblong, \' long; 

 calyx with the tube glabrous ; the teeth short, pubescent 

 on the margin ; petals white, rounded or slightly cordate 

 at the base ; leaflets 4-6 pairs, linear, oblong, with black 

 dots on the surface. — Drummond. 



P. GRTSEUM, Gray and Torrey. Pubescent; stem 2°-3° 

 high, terete, of a reddish color, usually branched in a 

 paniculate manner, either near the summit or from the 



