Astragalus. 



LEGUMINOS^. 



145 



Stipo lialf sliortcr : pod acute at base. 

 Stipo a (piartor of an inch long, half tho lpt)gtli of the pod. 

 Scsailo in tho calyx, bladdery, an inch or two long, niany-socdcd. 

 Corolla palo yellow, short and broad : stipuk-s herbaceous. 

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

 Stipules distinct : pod rather firm-walled. 

 Stipules united opposite the petiole : pod thin-bladdery. 

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

 the length of the caly.x. 

 llcrliMgn vilTou.4 when young : rniyx-tocth as long m \\\i\ tiibn. 

 llerbago puborulont when young : calyx-tccth sliortcr than tul)e. 

 Sessile in the calyx, hnlf an incli long : Jlower a (luartcr-inch long. 

 Nearly glabrous : pods capitate, ovnte, acuminate, 10- 16-seedod. 

 Villous: pods few, ovnte-incurved, 3-8-seeded. 



+ + ++ Pod coiiaceoiis or cartilaginous, or chartaceous, not bladdery-inflated, 



— liong-woolly or long-hairy, sessile in tho calyx, nmjiy-seeded. 



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



Plant and pods long-hairy, taller. 



Plant and pods downy with short hairs, slender. 



26. A. MALACUS. 



27. A. Andersonii. 



= — Pod glabrous or pubescent with short hairs. 



Pod conspicuously stipitate, the stipe eipialling 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. 

 Herbage minutely jmbescent : iiod glabrous. 

 Calyx not oblicpio ; ])()d straight, tliinner-walled, linonr-oblong. 

 Almost glabrous : pod obtuse nt Itaso ; stijxi half an inch long. 

 Hoary-puboscent : nod tapering into a stipo a (piarter-inc.h long. 

 Olabrous : stipe 2 lines long. 

 Two-colled by intrusion of the uorsnl suture, turgid. 

 Narrowly oblong, straight, erect. 

 Ovate, incurved, reflexed on the stipe. 

 Pod very short-stipitate in the calyx, i)eiidulous, oblong-linear, straight. 

 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 lore and aft, marginless, 

 curved at maturity. 

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

 Leaflets 11 to 21, crowded, 



Olwvate or roundish, loosely pubescent or glabrous : 



flowers jnirple. 

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

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

 Short-stipitate in the calyx, not erect. 

 Not at all stipitate, erect. 

 Many flowers and pods crowded in a dense spike. 

 Pods oblong, obtuse, 2-collpd, many-seeded. 

 Pods ovate, ncute, lenticular, 1 -colled, 2 - fi-sccded. 

 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. 

 Herbage and latei-ally flatfish pods very pubescent. 

 Stems or rootstocks not rising from I ho ground : loallols few : Hcii|)n 

 few-flowered ; pod sniiill. 

 Pod sessile in mid shorter than the calyx, few-seeded. 



* * Leaflets prickly pointed and rigid, persistent. 

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



37. A. Casei. 



