NORTH AMERICAN FLORA 



(Volume 24 



Stem 3-5 dm. high; stipules small, subulate to deltoid; pod ihiti- 

 walled. 

 Corolla 8—10 mm. long, purple-veined; leaflets obovate, 



scarcely notched. 

 Corolla 7-8 mm. long, white; leaflets ovate or oval, deeply 

 notched. 

 Calyx white-hairy. 



Leaves silky-canesccnt on both sides; keel not acuminate. 



Leaflets 7-11, oval-obovate, rounded at the apex; corolla purple. 

 Leaflets 9-19, linear or oblong, acute or obtuse; corolla white or 

 merely margined with purple. 

 Leaflets 9-15, linear, more than 1 cm. long. 

 Leaflets 15-19, oblong, 5-8 mm. long. 

 Leaflets glabrate above. 



5. Leptocarpae 



Calyx black-hairy; pod little or not at all compressed; calyx-teeth shorter 

 than the tube. 

 Pod glabrous, less than 2 cm. long. 



Leaflets cuneate or oblong-cuneate, truncate or retuse at the apex, 



less than 8 mm. long. 

 Leaflets linear, acute, 1-1.5 cm. long. 

 Pod finely strigose. 



Leaflets usually cuneate or oblong and retuse at the apex. 

 Pod 1-1.5 cm. long, slightly arcuate. 

 Pod about 3 cm. long or more. 



Pod tapering below into a stipe-like base, strongly arcuate, 



about 3 cm. long. 

 Pod slightly tapering below, the base not stipe-like, nearly 

 straight, 5-6 cm. long. 

 Leaflets linear, acute; pod about 2.5 cm. long, moderately arcuate. 

 Calyx white-hairy. 

 Pod glabrous. 



Leaflets retuse or truncate at the apex. 



Pod about 5 mm. wide, arcuate at the base; corolla about 12 mm. 



long. 

 Pod about 3 mm. wide or less; corolla 10 mm. long or less. 

 Pod straight; corolla 10 mm. long. 



Pod 2.5-3 cm. long; corolla about 1 cm. long. 

 Pod 1-1.5 cm. long; corolla about 8 mm. long. 

 Pod more or less arcuate; corolla 5-8 mm. long. 



Pod abruptly acute; plant green; stipules lanceolate or 

 lance-subulate. 

 Calyx-teeth longer than the tube; pod 3 mm. broad, 

 strongly arched at the base; plant erect or 

 ascending. 

 Calyx-teeth shorter than the tube; pod 1.5-2 mm. 

 wide, equally arched throughout; plant decumbent 

 or prostrate. 

 Pod gradually acute, equally arched throughout; plant 

 canescent, decumbent; stipules ovate. 

 Leaflets linear to oblong, acute or obtuse. 



Corolla about 1 cm. long; plant green; pod 2.5-3 cm. long. 

 Corolla 5-8 mm. long; plant canescent; pod 2 cm. long or less. 

 Pod completely 2-celled. 



Leaflets 7-11, those of the lower leaves oval to oblong. 

 Pubescence appressed. 

 Pubescence spreading. 

 Leaflets 3-7, all linear or linear-oblanceolate. 

 Pod with only partial partition. 

 Pod strigose; inflorescence sub-capitate, 1-5-flowered. 

 Leaflets oval to linear, acute to rounded at the apex. 

 Leaflets of the lower leaves very short, cuneate, often retuse at the 

 apex. 



6. ACUTIROSTRES 



Calyx-lobes much shorter than the tube; leaflets not retuse. 

 Calyx-lobes equaling or longer than the tube; leaflets retuse. 



7. HarTwegianae 



Plants about 3 dm. high, erect; raceme elongate. 

 Corolla purple, 7-8 mm. long. 

 Corolla white or ochroleucous. 

 Pod pubescent. 



Calyx black -hairy. 



Pod 7-9 mm. long, strigose. 



Pod black -hairy; leaflets linear. 

 Pod white-hairy; leaflets oblong. 

 Pod about 1 cm. long, strigulose. 



18. //. drepanoloba. 



19. H. Paysonii. 



20. H. albens. 



21. //. arizonica. 



22. H. Coahailae. 



23. H. madrensis. 



24. //. Bruceae. 



25. H. Kelloggiana. 



26. H. tenera. 



27. H. Clariana. 



28. H. Rallani. 



29. H. ratlanoides. 



30. H . Lindheimeri. 



31. H. leplocarpa. 



32. H.francisquilensis. 



33. H. Nultalliana. 



34. H. leptocarpoides. 



35. H. montereyensis. 



36. //. macilenta. 



37. H. Emoryana. 



38. H. davisiana. 



39. H. subuniflora. 



40. H. imperfecta. 



41. H. austrina. 



42. H. per tenuis. 



43. H. nothoxys. 



44. H. acutirostris. 



45. H. militaris. 



46. H. Sallonis. 



47. H. Goldmani. 



48. H. hidalgensis. 



