LEGUMINOS^E. (PULSE FAMILY.) 59 



* * Soft downy or silky-villous all over: leaflets 13 to 17 : spikes cylindrical. 



4. P. villosus, Nutt. Leaflets linear or oblong : spikes 1 to 5 inches long, 

 short-peduncled : corolla rose-color. Along the Upper Missouri and Missis- 

 sippi to N. Wisconsin. 



9. AMORPHA, L. FALSE INDIGO. LEAD PLANT. 



Standard erect, folded together. The flowers purple or violet, small, in 

 dense clustered terminal spikes. 



* Pods l-seeded: leaflets small, crowded. 



1. A. canescens, Nutt. Whitened with hoary down, 1 to 3 feet high: 

 leaflets 15 to 25 pairs, elliptical, smoothish above with age. From British 

 America to Texas and from Colorado to Indiana. 



2. A. microphylla, Pursh. Very low, nearly glabrous: leaflets some- 

 what ovate-elliptical, rigid : spikes solitary and aggregated. Along the 

 Platte to the mountains and northward to the plains of the Red River. 



* * Pods ^-seeded : leaflets scattered. 



3. A. fruticosa, L. Rather pubescent or smoothish: leaflets 8 to 12 

 pairs, oval. Along rivers from Colorado northeastward to British America 

 and eastward to Pennsylvania and Florida. 



10. PETERIA, Gray. 



Calyx tubular at base, gibbous above. Standard open at the apex, with 

 reflexed sides, narrowed into a long claw. Ovarv stipitate. 



1. P. scoparia, Gray. Rigid, branching, glabrous: leaflets numerous, 

 very small, entire ; stipules small, subulate : flowers scattered, yellowish. 

 PL Wright, i. 50. S. W. Colorado and southward. 



11. ROBINIA, L. LOCUST. 



Calyx slightly 2-lipped. Standard large and rounded, turned back. Trees 

 or shrubs, often with prickly spines for stipules : flowers showy, in hanging 

 axillary racemes. Base of the leaf-stalks covering the buds of the next year. 



1. R. NeO-Mexicana, Gray. Shrub 4 to 6 feet high : stipular prickles 

 subrecurved, sharp and stout : leaflets elliptical or oblong : peduncles and the 

 short crowded racemes hispid with straight glanduliferous hairs : calyx finely 

 hispid : corolla rose-color : pods glandular-hispid. S. Colorado and south- 

 ward. 



12. GLYCYRRHIZA, L. LIQUORICE. 



Flowers nearly as in Astragalus. Ovary sessile : style short and rigid. Pod 

 compressed, and often curved. Erect perennial herbs : flowers in dense 

 axillary pedunculate spikes, with caducous bracts : root large and sweet. 



1. G. lepidota, Pursh. Somewhat glandular-puberulent, or the younger 

 leaves slightly silky : leaflets 6 to 8 pairs, oblong-lanceolate : spike short : 

 flowers ochroleucous : pod thickly beset with hooked prickles. From Colo- 

 rado to New Mexico, westward into Nevada and N. California, and northward 

 to Washington Territory, and across the continent to Hudson's Bay. 



