502 LEGUMINOSAE (PULSE FAMILY) 



Flowers large and showy ; standard broad ; wings free. 

 29. Sesbania. Leaves even-pinnate. Ours herbs. 



80. Robinia. Pod flat, thin, margined on one edge. Trees or shrubs. 



81. Wisteria. Pod tumid, marginless. Woody twiners. Leaflets obscurely stipellate. 



= Standard narrow, erect ; pod turgid or inflated ; perennial herbs. 



32. Astragalus. Keel not tipped with a point or sharp appendage. Pod with one or both the 



sutures turned in, sometimes dividing the cell lengthwise into two. 



33. Oxytropis. Keel tipped with an erect point ; otherwise us AxtrayalH*. 



34. Glycyrrhiza. Flowers, etc., of Astragalus. Anther-cells confluent. Pod prickly or muri- 



cate, short, nearly indehiscent. 



----- Herbs ; no tendrils ; pod transversely 2-several-jointed, the reticulated 1-seeded joints 

 indehiscent, or sometimes reduced to one such joint. 

 +> Leaves pinnate, with several leaflets, not stipellate. 



35. Aeschynomene. Stamens equally diadelphous (5 and 5). Calyx 2-lipped. Pod several- 



jointed ; joints square. 



36. Coronilla. Stamens unequally diadelphous (9 and 1). Calyx 5-toothed. Joints subcylin- 



dric, 4-angled. Flowers umbellate. 

 87. Hedysarum. Stamens unequally diadelphous (9 and 1). Calyx 5-cleft. Pod several-jointed ; 



joints roundish. 



-H- 4+ Leaves pinnately 3-foliolate, rarely 1-foliolate. 

 38. Desmodium. Stamens diadelphous (9 and 1) or monadelphous below. Calyx 2-lipped. Pod 



several-jointed. Flowers all of one sort and complete. Leaflets stipellate. 

 89. Lespedeza. Stamens diadelphous (9 and 1); anthers uniform. Pod 1-2-jointed. Flowers 



often of 2 sorts, the more fertile ones apetalous. Leaflets not stipellate. 



40. Stylosanthes. Stamens monodelphous ; anthers of 2 sorts. Pod 1-2-jointed.- Calyx de- 



ciduous, the tube narrow and stalk-like. Leaflets not stipellate. 

 -H- -H- -M- Leaves digitately 2- or 4-foliolate. 



41. Zornia. Flowers spicate, each enveloped by 2 veiny leaf-like bracts. 



------ Herbs with abruptly pinnate leaves, terminated by a tendril or bristle ; stamens diadi-1- 

 phous ; pod continuous, 2-valved, few-several-seeded. 



42. Vicia. Wings coherent with the keel. Style filiform, bearded with 'a tuft or ring of hairs at 



the apex. 



43. Lathyrus. Wings nearly free. Style somewhat dilated and flattened upwards, bearded 



down the inner face. 



-*--!----+- Twining (sometimes only trailing) herbs ; leaves pinnately 8(rarely 1 or 5-T)-foliolate; 

 no tendrils ; peduncles or flowers axillary ; pod not jointed, 2-valved. 

 -n- Leaves pinnately 5-many-foliolate. 



44. Apios. Herbaceous twiners ; leaflets 6-9. Keel slender and much incurved or coiled. 



n- -n- Leaves 8-foliolate ; ovules and seeds several. 

 -= Style bearded lengthwise on the upper surface. 



45. Phaseolus. Keel spirally coiled ; standard recurved-spreading. Flowers racemose. Corolla 



(in ours) purple. Seeds round-reniform. 



46. Vigna. Keel strongly curved but not forming a spiral. Flowers few in pedunculate heads 



or very short racemes. Corolla (in ours) pale yellow. 



47. Stropbostyles. Keel long, strongly incurved but not forming a spiral. Flowers few in 



pedunculate heads. Corolla purple. Seed* oblong, mostly pubescent. 



48. Clitoria. Keel scythe-shaped ; standard spurred at the base, large and showy, pale blue. 



Style bearded at the summit about the stigma. 

 lit. Centrosema. Standard much longer than the other petals. Pod linear, narrow; the valves 



spirally twisted after dehiscence. 



50. Dolichos. Standard little exceeding the other petals in length. Pod lunate-oblong; the 

 valves broad, not spirally coiled in debiseence. 



Style beardless. 



61. Amphicarpa. Calyx tubular, 4-5-toothcd. Standard erect; keel almost straight. Some 

 apetalous especially fertile (lowers ut the base of the plant, liracts persistent. 



