POLYPETALOUS EXOGENOUS PLANTS. 235 



E. TOMENTOSA, ToiT. and Gray. Leaflets 1-3, round- 

 ish or ovate; racemes dense-llowered ; legume oblong. Ked 

 River. — Torrey. 



** stem tall, erect, with long virgate branches; flowers solitary or hrj pairs, in the 

 axils of the upper leaves ; calyx deeply i-cleft, shorter than the corolla. 



E. GALACTOIDES. Stem bushy, purplish, closely pubes- 

 cent; leaves very small, almost sessile; leaflets 3, oval or 

 obovate, rigid, reticulate, pubescent ; flo2vers mostly longer 

 than the leaves, yellow, the vexillum reddish externally ; 

 legitme oblong, 2-seeded. Stem 2°-4° high ; leaflets 3"-9" 

 long ; legume f ' long. 



E. Texana. Minutely velvety- pubescent; steins dif- 

 fuse, much branched from the base; stipules setaceous, 

 minute; leaflets rhombic-ovate or ovate-lanceolate, obtuse, 

 mucronulate, rounded or slightly cordate at the base, 

 pubescent and dotted, with minute resinous glands be- 

 neath, the upper surface reticulated and nearly gla- 

 brous ; peduncles axillary, mostly 1-flowered, much shorter 

 than the petioles ; teetJi of the calyx attenuate-subulate, 

 rather shorter than the corolla; legumes pubescent, ob- 

 long, narrowed at the base, nearly straight. — Drummond, 



APIOS, Boerh. 



Calyx somewhat 2-lipped, the lateral teeth nearly ob- 

 solete, the lowest one longest; vexillum very broad, re- 

 flexed ; the Tceel at length twisted ; stamens diadelphous 

 (9 and 1) ; legume nearly terete, many-seeded. — A smooth, 

 perennial, twining herh, with unequally pinnate leaves, and 

 brownish-purple /o?(;er5 in dense axillary racemes. 



A. TUBEROSA, Moench. Stem twining, high ; leaflets 

 5-7, ovate or ovate-lanceolate; racemes often by pairs, 

 shorter than the leaves ; root bearing small edible tubers ; 

 seeds black, separated by loose cellular tissue. 



