POLYPETALOUS EXOGENOUS PLANTS. 241 



B. viLLOSA, Ell. Pubescent; haves short-petioled ; 

 leaflets oblong and obovate, tapering at the base, becoming 

 smooth above; lower stijmles and lanceolate bracts per- 

 sistent ; racemes many-flowered, declining ; ovary villous ; 

 legume smoothish, coriaceous, oblong, strongly beaked; 

 stem 2° high. Leaves and flowers larger than B. lan- 

 ceolata. 



B. SPH^ROCARPA, Nutt. Glabrous ; leaves nearly ses- 

 sile; leaflets obovate-oblong, obtuse, minutely pubescent 

 when young; stipules and hracts minute or almost none; 

 stem 2°-3° high, many from the same roots, with erect 

 hranclies ; flowers large, usually in a long strict spike, deep 

 yellow; teeth of calyx short, very acute; the upper ones 

 obtuse; ovary glabrous; stipe short. Near Fort Town- 

 send. — Dr, Leavemvortli. 



tt Flowers white. 



B. LEUCANTHA, Nutt., Torr. and Gray. Smooth and 

 glaucous ; branches spreading ; leaves short-petioled ; leaf- 

 lets oblong and obovate, obtuse; stipules lanceolate, as long 

 as the petioles, deciduous ; racemes central and terminat- 

 ing the branches, long, many-flowered; ovary smooth; 

 legume large, oblong, much inflated, long-stipitate. Leg- 

 ume IJ' long. 



B. LEUCOPH^A, Nutt. Hairy or smoothish ; stem stout, 

 angled ; leaves short-petioled ; leaflets varying from ob- 

 lanceolate to obovate, rigid, reticulate, soon smooth above; 

 stipules and hracts leafy, ovate-lanceolate, persistent ; ra- 

 cemes stout, declined, 1-sided; flowers large, yellowish- 

 white, on long and slender erect pedicels; ovai\i/ villous; 

 legume ovoid, long-pointed. Stem low, with widely spread- 

 ing branches; racemes 4-12' long; flowers 1' long, the 

 vexillum spotted with brown. 



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