Amorpha Leguminosae 599 



clearings, in sandy soil near the bases of black oak ridges, and in prairie 

 habitats. 



Va., Ohio, to Kans., southw. to Fla. and Tex. 



3707. AMORPHA L. 



[Palmer, E. J., Conspectus of the genus Amorpha. Jour. Arnold 

 Arboretum 12:157-197. 1931.] 



Mr. Palmer has seen all of my specimens of Amorpha fruticosa and 

 varieties and made the key to them which is used here. 



Calyx lobes lanceolate, as long as or longer than the tube; shrubs of a dry, sandy or 

 gravelly habitat, mostly less than 1 m high, densely canescent ; leaflets of the upper 

 part of the stem generally 15-20 pairs, crowded, canescent beneath, 1-2 cm long. 



1. A. canescens. 



Calyx lobes deltoid or half-rounded, much shorter than the tube; shrubs of moist or 

 rocky banks, 1-4 m high, more or less pubescent; leaflets of upper part of stem 

 mostly 7-15 pairs, rarely as many as 20 pairs, generally not crowded, 2-4 cm 

 long. 

 Pubescence of petiolules and leaflets consisting of curled or matted hairs. 



Leaflets mainly rounded or short-pointed at the apex 2. A. fruticosa. 



Leaflets mainly truncate or emarginate at the apex 



2a. A. fruticosa var. eviarginata. 



Pubescence of petiolules and leaflets consisting of short, straight, appressed hairs, 

 or nearly absent. 

 Leaflets obovate or oval, not conspicuously crowded, with appressed pubescence. 



2b. A. fruticosa var. angustifolia. 



Leaflets oblong, more numerous and crowded, glabrous or nearly so. (Some ex- 

 cluded specimens may be this variety.) A. fruticosa var. oblongifolia. 



1. Amorpha canescens Nutt. Leadplant. Map 1225. This species 

 is infrequent and is restricted to the area shown on the map. It is found 

 in dry, sandy or gravelly soil on knolls and ridges or in a prairie habitat 

 in the open along roadsides or in open woodland. 



Mich, and Ind. to Man., southw. through the Mississippi Valley to Ark., 

 N. Mex., and Tex. 



2. Amorpha fruticosa L. Indigobush. Map 1226. As represented by 

 my specimens this species is restricted to the alluvial bottoms and banks 

 of the Lower Wabash Valley and the moist or rocky slopes of the Ohio 

 River. I have one specimen, however, which is from sandy soil near the 

 Kankakee River south of Thayer, Lake County. Amorpha fruticosa and its 

 varieties are locally common in the southwestern part of Posey County 

 and in the southwestern part of Vigo County on the banks of sloughs and 

 swamps where it is usually closely associated with buttonbush. 



?Conn. to Minn., southw. to Ala. and Okla. ; escaped from cultivation 

 in the northeast. 



2a. Amorpha fruticosa var. emarginata Pursh. My only specimens of 

 this variety are from the borders of sloughs in Gibson County. 

 Miss, to Ark. and 111. 



2b. Amorpha fruticosa var. angustifolia Pursh. I have this variety 



