128 American Midland Naturalist Monograph No. 7 



27. Erect or weak twining herbs; leaflets seldom 



lobed ; flowers without the odor of grapes. 



28. Calyx usually 5-toothed, not bracteolate; 



leaflets ovate 39. Amphicarpa 



28. Calyx deeply 4-cleft, subtended by a 



pair of bractlets; leaflets oval 



40. Galactia 



26. Style pubescent on the upper surface. 



29. Flowers yellow; stems twining; leaflets 



ovate; pods 10-20 cm long 35. Vigna 



29. Flowers bluish or nearly white. 



30. Flowers 4-5 cm long, solitary or in pairs 

 in the axils, pale blue and lilac, deli- 

 cately veined ; stem ascending or 



twining 37. Clitoria 



30. Flowers smaller, racemose or umbellate. 

 31. Flowers in short sessile axillary 

 racemes; stem erect; pods straight 

 or nearly so, almost sessile, some- 

 what flattened 34. Glycine 



31. Flowers in racemes or umbels on 



long axillaiy perduncles; stems 



twining or trailing. 



32. Flowers in long loose racemes; 



keel of the corolla spirally 



coiled; pods falcate 



33. Phaseolus 



32. Flowers few, in umbel-like 

 clusters; keel of the corolla 

 strongly incurved but not 

 spirally coiled ; pods straight 

 or nearly so 36. Strophostyles 



15. Leaves with 5 or more leaflets. 



33. Leaves punctate. 



34. Pods covered with hooked prickles; flowers whitish; 



stamens 10 25. Glycyrrhiza 



34. Pods without hooked prickles. 



35. Corolla of 1 petal; stamens 10 17. Amorpha 



35. Corolla of 5 petals. 



36. Stamens 10 or rarely 9; leaflets (in our species) 



4-6 mm long 18. Dalea 



36. Stamens 5; leaflets (in our species) 6-35 mm long 



19. Petalostemum 



33. Leaves not punctate; corolla papilionaceous; pods several- 

 seeded. 

 37. Leaflets 5-11. 



38. Flowers yellow, borne in umbels 11. Lotus 



38. Flowers not yellow, borne in axillary or terminal 

 racemes. 



39. Stems twining or climbing; leaflets 5-7 (rarely 3), 

 ovate or ovate-lanceolate; flowers in axillary 

 racemes 32. Apios 



