502 LEGUMINOSAE (PULSE FAMILY) 



= = Flowers large and showy ; standard broad ; wings free. 



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



30. 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 th 



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



33. Ozytropis. Keel tipped with an erect point ; otherwise as Astragalus. 



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



cate, short, nearly indehiscent. 



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

 indehiscent, or sometimes reduced to one such joint. 

 H- Leaves pinnate, with several leaflets, not stipellate. 



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



jointed ; joints square. 



86. 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. 



*+ ++ 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. 



39. 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- ++ ++ Leaves digitately 2- or 4-foliolate. 



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



--- -i- Herbs with abruptly pinnate leaves, terminated by a tendril or bristle ; stamens diadel- 

 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 5-7)-foliolate; 



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



*+ Leaves pinnately 6-many-foliolate. 



44. Apios. Herbaceous twiners ; leaflets 5-9. Keel slender and much incurved or coiled. 



+* ++ 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. Strophostyles. Keel long, strongly incurved but not forming a spiral. Flowers few in 



pedunculate heads. Corolla purple. Seeds 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. 



49. 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 dehiscence. 



Style beardless. 



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

 apetalous especially fertile flowers at the base of the plant. Bracts persistent. 



