liEGUMlNOSAE (PEA FAMILY) 



281 



SERIES I 



Pods fleshy, somewhat plum-shaped, indehiscent (GEOPRUMNON). 

 Flowers ochroleucous, the keel purple-tipped .... 



Flowers purple, often pale 



Pods not fleshy, dehiscent. 



Pod^ not inflated, membranous or leathery. 

 Pods ovate or oblong, leathery (ASTRAGALUS). 

 Plants densely villous-canescent throughout. 



Pods glabrous 



Pods woolly 



Plants glabrate or appressed strigose-pubescent. 



Stems erect, 3-10 dm. high; flowers ochroleucous, spreading 

 or reflexed in the dense spike ..... 

 Stems ascending, 1-3 dm, high*; flowers ascending, in a 

 short spike. 

 Stems stoutish; spike oblong; pod sessile. 



Flowers purpHsh 



Flowers ochroleucous 



Stems weak, spikes capitate; pod stipitate . 

 Pods ascending, broadly linear, flattened, membranous 

 (HAMOSA). '■ 



Caulescent; greenish, sparsely hirsute 



Acaulescent; silvery-silky 



Pods conspicuously inflated, papery (CYSTIUM), 



Nearly glabrous throughout 



Subcinereous or strigiuose 



1. A. suGculentus. 



2. A. crassicarpus. 



3. A. molliss&nus. 



4. A. Bigelovii. 



5. A. carolinianus. 



6. A. nitidus. 



7. A, sulphurescens. 



8. A. hypoglottis. 



9. A. Nuttallianus. 



10, A. calycosus. 



11, A. diphysus. 



12, A. ineptus. 



SERIES n 



Pods deeply sulcate dorsally, this suture being thus deeply intruded 

 and the pod obcordate in cross section (TIUM). 

 Stems rather stout, suberect; flowers yellowish; pods 3 cm. or 

 more long, exsert-stipitate, spreading or pendent. 

 Plant woolly-pubescent ........ 



Plant appressed-pubescent or glabrate. 



Leaflets obovate-oblong, glabrous above .... 



Leaflets linear-oblong, glabrate on both faces 

 Stems slender, flexuous or spreading: flowers not yellow; pods 

 less than 2 cm. long, short-stipitate or subsessile. 

 Pods black-hairy; stipe as long as the caXyx. .... 



Pods pale-pubescent; stipe short or wanting,' 



Pods coriaceous, mottled, incurved ..... 



Pods chartaceotis, deflexed 



Pods slightly if at all sulcate dorsally, one or both of the sutures in- 

 truded but rarely deeply so (the sections Xylophacos and 

 Phaca quite variable). 

 Pods membranous, coriaceous or woodyt not conspicuously in- 

 flated 

 Pods membranous (ATELOPHRAGMA). 

 Pods exsert stipitate. 



Leaves cinereous-pubescent on both faces 



Leaves glabrotis or minutely appressed-pubescent beneath. 



Pods glabrous 



Pods black-hairy 



Pods sessile or nearly so. 



Pods reflexed . . . , 



Pods ascending . 



Pods coriaceous or woody. 



Pods stipitate; leaves unifoliolate (JONESIELLA) , 

 Pods sessile; leaves pinnate. 



Tall glabrous perennial; calyx-tube not longer than its 



lobes (PHACOPSIS) 



Ix>w caespitose perennials; the calyx-tube longer than its 

 lobes (XYLOPHACOS). 

 Pods coriaceous, more or less pubescent but not woolly. 

 Herbage appressed silvery-silky. 

 Pods obtuse at base. 



Pods elliptical, straight 



Pods curved or incurved at tip. 



Pods not noticeably veined . . . , 



Pods transversely veined and finely reticulated 



Pods tapering to both ends ..... 



Herbage glabrate or villous with loose spreading hairs. 

 Leaves glabrous, at least above. 



Pods sessile ....... 



Pods stipitate ,...,,. 

 ■ Leaves isoftly villous. 



13. A. Drummondii. 



14. A. scopulorum. 



15. A. racemosus. 



16. A. alpinus. 



17. A. sparsiflorus, 



18. A. desperatus. 



19. A. aboriginorum. 



20. A. glabriusculus. 



21. A. Macounii. 



22. A. elegans. 



23. A. Brandegei. 



24. A, asclepiadoides, 



25. A. Fattersonii. 



26. A. missouriensis, 



27. A. Shortianus. 



28. A. chamaeluce. 



29. A. amphioxus. 



30. A. cibarus. 



31. A. Beckwithii. 



