Astragalus. 



LEGUMINOS^J. 



145 



18. A. OOCAKPUS. 



A. CROTALARLS:. 

 A. MENZIESII. 



A. PURSHII. 



26. A. MALACUS. 



27. A. ANDERSONIL 



Stipe half shorter : pod acute at base. 16. A. LEUCOPSIS. 



Stipe a quarter of an inch long, half the length of the pod. 17. A. TRICHOPHYLLUS. 



Sessile in the calyx, bladdery, an inch or two long, many-seeded. 

 Corolla pale yellow, short and broad : stipules herbaceous. 

 Corolla white or whitish, narrow, an inch long : stipules scarious. 

 Stipules distinct : pod rather firm- walled. 19. 



Stipules united opposite the petiole : pod thin-bladdery. 20. 



Corolla yellowish-white or cream-color, 4 lines long, hardly twice 



the length of the calyx. 



Herbage villous when young : calyx-teeth as long as the tube. 21. A. MACRODON. 

 Herbage puberulent when young : calyx-teeth shorter than tube. 22. A. DOUGLASII. 

 Sessile in the calyx, half an inch long : flower a quarter-inch long. 



Nearly glabrous : pods capitate, ovate, acuminate, 10-15-seeded. 23. A. HORNII. 

 Villous : pods few, ovate-incurved, 3 - 8-seeded. 24. A. PULSIFER.E. 



H- -H- Pod coriaceous or cartilaginous, or chartaceous, not bladdery-inflated, 

 = Long-woolly or long-hairy, sessile in the calyx, many-seeded. 



Plant white with soft wool, very low : pod densely woolly. 25. 



Plant and pods long-hairy, taller. 



Plant and pods downy with short hairs, slender. 



= = Pod glabrous or pubescent with short hairs. 



Pod conspicuously stipitate, the stipe equalling or surpassing the calyx, 

 One-celled, both sutures prominent externally. 

 Calyx very obliquely attached to the pedicel and recurved on it : 



pod curved or coiled, rigid. 



Herbage soft-downy : pod pubescent. 28. A. CYRTOIDES. 



Herbage minutely pubescent : pod glabrous. 29. A. SPEIROCARPUS. 



Calyx not oblique : pod straight, thinner-walled, linear-oblong. 



Almost glabrous : pod obtuse at base ; stipe half an inch long. 30. A. FILIPES. 

 Hoary-pubescent : pod tapering into a stipe a quarter-inch long. 31. A. ANTISELLI. 

 Glabrous : stipe 2 lines long. 32. A. PORRECTUS. 



Two-celled by intrusion of the dorsal suture, turgid, 



Narrowly oblong, straight, erect. 33. A. ARRECTUS. 



Ovate, incurved, reflexed on the stipe. 34. A. BOLANDERI. 



Pod very short -stipitate in the calyx, pendulous, oblong-linear, straight. 40. A. ATRATUS. 

 Pod sessile in the calyx or nearly so, and exceeding it. 

 Stems a span to a foot or more high. 



Flowers an inch long, few : pod oval, 1 -celled. 

 Flowers one third to two thirds of an inch long, 

 Few or scattered in the spike. 



Pod flattened fore and aft, wing-margined. 



Pod more or less flattened or narrower fore and aft, marginless, 



curved at maturity. 



Leaflets 5 to 15, linear, scattered, hoary-pubescent. 

 Leaflets 11 to 21, crowded, 



Obovate or roundish, loosely pubescent or glabrous : 



flowers purple. 38. 



Oblong or obovate, minutely silvery-silky : flowers white. 39. 

 Pod terete with a groove on the back, narrow, straight, 

 Short-stipitate in the calyx, not erect. 40. 



Not at all stipitate, erect. 41. 



Many flowers and pods crowded in a dense spike. 



Pods oblong, obtuse, 2-celled, many-seeded. 42. 



Pods ovate, acute, lenticular, 1 -celled, 2-5-seeded. 43. 



Flowers and few-seeded 2-celled pods only 2 or 3 lines long. 



Herbage and turgid pods minutely pubescent ; the latter grooved 



on the back. 44. A. LEMMONI. 



Herbage and laterally flattish pods very pubescent. 45. A. LENTIFORMIS. 



Stems or rootstocks not rising from the ground : leaflets few : scape 



few-flowered : pod small. 46. A. CALYCOSUS. 



Pod sessile in and shorter than the calyx, few-seeded. 47. A. AUSTINJG. 



* * Leaflets prickly pointed and rigid, persistent. 

 Peduncles very short, 1 - 3-flowered : pod very small, 1 - 4-seeded. 48. A. KENTROPHYTA. 



35. A. NUDUS. 



36. A. PTEROCARPUS. 



37. A. CASEI. 



A. TODANTHUS. 



A. WEBBERI. 



A. ATRATUS. 

 A. OBSCURUS. 



A. MORTONI. 



A. PYCNOSTACHYUS. 



