120 ELEMENTS OF BOTANY. 



nearly equal ; standard ovate or orbicular, keel incurved, 

 obtuse ; stamens monadelphous or diadelphous, 5 of the 

 anthers often abortive ; ovary nearly sessile ; pod included 

 in the calyx, often wrinkled, indehiscent, 1-seeded. 



P. PEDUNCULATA (Mill.) Yail. Samson's Snakeroot. Stem 

 erect, slender, branching above, pubescent, 1-2 ft. high ; leaves tri- 

 foliate ; petioles shorter than the leaflets ; stipules subulate ; leaflets 

 elliptical or oblong-lanceolate, sparingly glandular-dotted, the termi- 

 nal one stalked; loosely flowered spikes axillary and terminal, on 

 peduncles nmch longer than the leaves ; flowers blue or purple, about 

 i in. long; pod compressed-globose, wrinkled transversely. May- 

 June. Dry soil. 



VIII. AMORPHA. 



Small shrubs, glandular-dotted; leaves odd-pinnate; flowers 

 purple, blue or white, in slender spikes or racemes ; calyx 

 5-toothed, persistent ; standard obovate, concave, wings and 

 keel none ; stamens monadelphous, long-exserted ; ovary 

 sessile ; legume curved, glandular-roughened, 1-2-seeded, in- 

 dehiscent. 



1. A. FRUTicosA L. False Indigo. A shrub 6-15 ft. high, 

 with smooth, dark-brown bark ; leaves petioled ; leaflets 1.5-21, 

 short-stalked, oblong, obtuse or emarginate, sparingly punctate with 

 pellucid dots ; slender flowering spikes panicled or solitary, 4-6 in. 

 long ; flowers blue or purple ; calyx teeth short, nearly equal, pubes- 

 cent ; pod glandular. May-June. River banks. 



2: A. canescens Pursh. Lead-plant. A diffuse shrub 1-2 ft. 

 high ; branches and leaves covered with a dense, lead-colored pubes- 

 cence ; leaves sessile ; leaflets very numerous, crowded, small, ellip- 

 tical ; spikes short, clustered, densely flowered ; flowers bright blue ; 

 pod a little longer than the calyx, 1-seeded. June-July. On dry 

 hills. 



IX. CRACCA. 



Perennial herbs ; leaves odd-pinnate ; stipules small ; leaf- 

 lets entire ; flowers in terminal and axillary racemes or clus- 

 ters ; calyx about equally 5-cleft ; standard orbicular, reflexed, 

 silky on the outside, about as long as the coherent wings and 

 keel ; stamens monadelphous or diadelphous ; legume linear, 

 compressed, several-seeded. 



