POLYPETALOUS EXOGENOUS PLANTS. 243 



equal, spreading, the upper one concave, one or moj'c 

 of them often glandular at the base; stamens 10, filaments 

 mostly hairy or glandular, and thickened or dilated 

 toward the base, nearly equal ; antliers oval, nearly uni- 

 form ; style as long as the stamens, somewhat thickened 

 at the apex ; legume oblong or linear, often falcate, com- 

 pressed, dry, 2-valved, 2-seeded. — Low perennial herbs 

 or suftVutescent plants, often dotted with black glands; 

 leaves abruptly or unequally bipinnate; racemes opposite 

 the \QVi\QS\ floiuers yellow; glands either sessile or pedi- 

 cellate. 



H. Drummondii. Glabrous, with a few scattered pedi- 

 cellate glands; 5^em diffuse, suflfrutescent; pinnae 3 (digi- 

 tate), abruptly 8-12 foliolate ; leaflets elliptical, obtuse or 

 retuse ; legumes lunate-ovate, glabrous ; ])lant low and 

 much branched, with a very few subulate scarcely capitate 

 glands on the lower side of the petioles; leaves small, 

 upper petal with a reddish spot. In some flowers we have 

 not observed the stipules; ovules about 5-seeded. In 

 some flowers the alternate filaments are almost filiform 

 and nearly glabrous, while those opposite the sepals are 

 thickened and clothed with glandular hairs. — Torrey and 

 Gray. 



H. CAUDATA, Gray. SJirnhhy ; leaves bipinnate, pinnae 

 2-3-paired; leaflets small, 20-30-paired, smooth, round or 

 obliquely subcord ate, veins glandular; stipules and bracts 

 caducous; leaflets about two lines in length, thickish, 

 obscurely mucronulate, subsessile, oblique. The terminal 

 pinnae are sometimes 2 and 3 inches in length, and bear 

 many pairs of leaflets, while the lateral ones are scarcely an 

 inch long; raceme sparsely 6-9-flowered ; legume nearly 

 2 inches long and f of an inch wide. Sandy soil, Western 

 Texas. 



H. Jamesii. Canescently pubescent; stijmles &\xh\Waie, 

 entire, pinnae 5 (2 pairs and a terminal one), abruptly 



