GENUS 16. 



PEA FAMILY. 



365 



13. Psoralea Onobrychis Nutt. Sainfoin 

 Psoralea. French-grass. Fig. 2503. 



Stylosanthes raceinosa Nutt. Fraser Cat. Name only. 

 1813. 



Psoralea Onobrychis Nutt. Gen. 2: 104. 1818. 



Glabrous or slightly pubescent, branched, 3-6 

 high. Glands of the foliage few and small ; stipules 

 subulate; petioles about equalling the 3-foliolate 

 leaves; leaflets ovate-lanceolate, 2'-^' long, i'-2' 

 wide, entire, rounded or truncate at the base, acu- 

 minate at the apex, the terminal one on a stalk about 

 i' long; racemes numerous, axillary and terminal, 

 very slender and loosely flowered, 3'-6' long; pedun- 

 cles equalling or shorter than the leaves; flowers 

 purplish, ii'-2' long; pod obliquely ovoid, 4"-6" long, 

 transversely wrinkled and roughened with points. 



Along rivers, southern Ontario to Tennessee, South 

 Carolina and Missouri. June-July. 



17. AMORPHA L. Sp. PL- 713. 1753. 



Glandular-punctate shrubs, with odd-pinnate leaves, and small violet blue or white flowers, 

 in dense terminal spicate racemes. Calyx-teeth nearly equal, or the lower ones longer; 

 standard obovate, erect, clawed, folded around the stamens and style; wings and keel none. 

 Stamens monadelphous below ; anthers all alike. Ovary sessile, 2-celled ; style curved ; stigma 

 terminal. Pod short, oblong, curved, nearly indehiscent, i-2-seeded. [Greek, deformed, four 

 petals being absent.] 



About 15 species, natives of North America and Mexico. Type species: Amorpha fruticosa L. 



Tall shrub ; leaflets i'-2 f long; pod usually 2-seeded. 

 Low shrubs ; leaflets 3"-6" long ; pod i-seeded. 



Glabrous or nearly so ; spikes commonly solitary. 



Densely canescent ; spikes commonly clustered. 



1. A. fruticosa. 



2. A. nana. 



3. A. canescens. 



i. Amorpha fruticosa L. False or Bastard 

 Indigo. River-locust. Fig. 2504. 



Amorpha fruticosa L. Sp. PI. 713. 1753- 



A shrub S-2O high, with pubescent or gla- 

 brous foliage. Leaves thin, petioled, 6'-i6' long; 

 leaflets 11-21, distant, short-stalked, oval or ellip- 

 tic, obtuse and mucronulate, or sometimes slightly 

 emarginate at the apex, rounded or slightly nar- 

 rowed at the base, i'-2' long, 5"-io" wide, entire; 

 spike-like racemes dense, clustered or solitary, 

 3'-6' long; flowers short-pedicelled, 3 "-4" long; 

 standard violet-purple, 2-3 times as long as the 

 calyx, emarginate; stamens exserted; pod gla- 

 brous, glandular, thick-stalked, 3"-4" long, acute, 

 usually 2-seeded. 



Along streams, Pennsylvania and Ohio to Minne- 

 sota, Saskatchewan, Florida, Colorado and Chihua- 

 hua. Also escaped from cultivation in the Eastern 

 and Middle States. May-July. 



Amorpha angustifolia (Pursh) Boynton, of 

 Texas and Oklahoma, with thick leaflets, acute at 

 both ends, is recorded from Iowa. 



