VOI,. II. 



PEA FAMILY. 



263 



High-climbing woody vines. 

 Trees or shrubs. 

 Herbs; leaves evenly pinnate. 

 Standard narrow; our species all herbs. 



Pod not prickly; foliage not glandular-punctate. 

 Keel of the corolla blunt. 



leaves pinnate, or simple. 



Pod not flattened, swollen, or one or both sutures intruded. 

 Pod not much swollen, fleshy, leathery or papery. 

 Pod much inflated, membranous. 

 Pod flat, both sutures prominent externally. 

 Leaves 3-foliolate. 

 Keel of the corolla acute. 

 Pod prickly; foliage glandular-punctate. 



Tribe 8. HEDYSAREAE. 



Leaves odd-pinnate. 



Flowers purplish, umbellate. 



Flowers purple or white, racemose. 



Flowers yellow, small. 

 Leaves 4-foliolate or 2-foliolate. 

 Leaves 3-foliolate, the terminal leaflet stalked. 



Flowers yellow. 



Flowers purple, blue or white. 



Pod of several joints; leaflets stipellate. 

 Pod of i or 2 joints; leaflets not stipellate. 



Tribe 9. VICIEAE. 



Style slender, with a tuft of hairs at the summit. 

 Style flattened, bearded along the inner side. 



20. Kraunhia. 



21. Robinia. 



22. Sesban. 



23. Astragalus. 



24. Phaca. 



25. Homalobus. 



26. Orophaca. 



27. Spiesia. 



28. Glycyrrhiza. 



29. Coronilla. 



30. Hedysarum. 



31. AEschynomene. 



33. Zornia. 



32. Stylosanthes. 



34. Meibomia. 



35. Lespedeza. 



36. Vicia. 



37. Lathyrus. 



Tribe 10. PHASEOLEAE. 



Style bearded along the inner side; rachis not thickened at the insertion of the flowers; keel of 



corolla not curved nor coiled. 39. Clitoria. 



Style glabrous, or slightly pubescent below; keel of corolla not curved nor coiled. 



Standard spurred at the base. 38. Bradburya. 



Standard not spurred. 



Flowers blue, purple, purplish, or white. 



Leaves odd-pinnate; leaflets 5^7. 41. Apios. 



Leaves 3-foholate, rarely i-foliolate. 



Calyx tubular, not bracteolate. 40. Falcata. 



Calyx short, bracteolate. 42. Galactia. 



Flowers yellow. 43- Rhynchosia, 



Style bearded along the inner side; rachis thickened at the insertion of the flowers. 



Keel of the corolla spirally coiled; flowers racemed. 44. Phaseolus. 



Keel of the corolla strongly incurved; flowers purple, capitate. 45. Strophostyles. 



Keel of the corolla short, slightly incurved; flowers yellowish, capitate. 46. Vigna. 



i. SOPHORA L. Sp. PI. 373. 1753. 



Shrubs, perennial herbs, or in tropical regions trees, with odd-pinnate leaves and white 

 yellow or violet flowers in terminal racemes or panicles. Calyx generally campanulate, its 

 teeth short. Standard obovate or orbicular, erect or spreading; wings obliquely oblong; 

 keel oblong, nearly straight. Stamens all distinct or very nearly so; anthers versatile, all 

 alike; style incurved. Ovary short-stalked; ovules co. Pod stalked in the calyx, coriaceous 

 or fleshy, terete, constricted between the seeds, mainly indehiscent. [Name Arabic, yellow.] 



About 25 species, natives of warm and tropical regions of both hemispheres. Besides the fol- 

 lowing, about 5 others occur in the southern and southwestern States. 



i. Sophora sericea Nutt. Silky 

 Sophora. (Fig. 2045.) 



Sophora sericea Nutt. Gen. i: 280. 1818. 

 Astragalus carnosus Pursh, Fl. Am. Sept. 740. In 



part. 1814. 



Herbaceous, woody at the base, erect or ascend- 

 ing, branched, silky or silvery pubescent with 

 appressed hairs, 6 / -i2 / high. Stipules subulate, de- 

 ciduous; leaves short-petioled ; leaflets 7-25, short- 

 stalked, obovate or elliptic, obtuse or emarginate at 

 the apex, narrowed or cuneate at the base, 3 // -6 // 

 long; raceme peduncled, rather loosely flowered, 

 2 / -4 / long; flowers white, about 8" long, nearly 

 sessile; pod dry, coriaceous, \'-i f long, about i" 

 thick, finely pubescent, few-seeded. 



Prairies, Nebraska and Colorado to Texas and Ari- 

 zona. April-June. 



