330 



NORTH AMERICAN FLORA 



[Volume 24 



Leaflets elliptic to broadly linear; corolla twice as long as the 



calyx or less. 

 Leaflets narrowly linear; corolla about three times as long as 

 the calyx. 

 Leaflets broadly obovate or obcordate; stems usually less than 3 

 dm. high. 

 Corolla less than 1 cm. long; banner rather strongly arcuate at the 

 middle. 

 Leaflets narrowly linear or abortive; plants with running root- 

 stocks; corolla ochroleucous. 

 Leaflets elliptic; plants with a cespitose caudex; corolla purple. 

 Pod decidedly obovoid, broadest above the middle; low plants with a 

 cespitose caudex. 



B. CHARTOCYSTIS 



Pod ellipsoid, round in cross-section, broadest at the middle, or, if somewhat 

 ovoid (P. oocarpa) or with the upper suture straight (P. topoensis and 

 P. allochroa) , both sutures rounded. 

 Pod more than 1 cm. long. 



Corolla more than 1 cm. long, ochroleucous or white, or rarely purplish 

 (P. candidissima and P. allochroa). 

 Plant mostly tall, the leaflets not crowded. 



Calyx-lobes deltoid, one fourth to one third as long as the tube; 



banner rather broad, abruptly arcuate at the middle. 

 Calyx-lobes lanceolate or subulate, at least half as long as the 

 tube. 

 Plant green, neither densely white-tomentose nor white- 

 villous (somewhat villous in P. densi folia). 

 Racemes rather lax; banner broad and strongly arched 



at the middle, much longer than the wings. 

 Racemes dense; banner narrower and moderately 

 arched, slightly longer than the wings. 

 Plant densely white-tomentose or white-villous. 

 Plant low, the internodes short, the leaflets crowded, white-tomen- 

 tose. 

 Corolla 8 mm. long or less; banner strongly arched. 

 Plants perennial. 



Stems numerous, decumbent or spreading, from a woody 

 caudex; leaflets crowded, less than 5 mm. long; pod round- 

 ellipsoid, mottled. 

 Stems few, from creeping rootstocks; leaflets not crowded, 6—10 

 mm. long; pod narrowly ellipsoid, not mottled. 

 Plants annual, or short-lived perennials ; stem erect, branched at the 

 base; leaflets more than 5 mm. long, not crowded. 

 Pod less than 1 cm. long. 



Plant low, subacaulescent; leaves crowded, with numerous stiff linear 



leaflets. 

 Plant with elongate slender stems; leaves and leaflets not crowded. 

 Pod obliquely ovoid, broadest below the middle, the upper suture usually 

 acute, straight or concavely curved, if convex less so than the lower. 

 Annuals or short-lived perennials, not with a cespitose caudex; racemes 



usually lax. 

 Perennials, with a cespitose caudex. 



Racemes few-flowered; plants low, decumbent. 

 Racemes dense, many-flowered; plants tall, stout. 



3. Trichopodae. 



4. cusickianae. 



5. Megacarpae. 



7. PlCTAE. 



8. NUTANTES. 



6. HOOKERIANAE. 



10. DOUGLASIANAE. 



11. Densifoliae. 



12. Candidissimae. 



14. Serpentes. 



15. Pol ares. 



16. CandollEanae. 



20. JEJUNAE. 



21. Microcystes. 



18. Pubentissimae. 



19. Pychnostachyae. 



C. DERMATOCYSTIS 



Corolla 15-20 mm. long, mostly purple; pod stipitate, ascending. 22. PreussianaE. 



Corolla 10-15 mm. long, white; pod strictly sessile, ascending ovoid. 23. NeglEctaE. 



Leaves sparingly pilose beneath; calyx not black-hairy; pod glabrous. 

 Leaves densely villous beneath; calyx and pod black-hairy. 



1. P. americana. 



2. P. IMoralis. 



One species. 



2. Oxvphysae 



3. Trichopodae 



3. P. oxyphysa. 



Stipe of the pod much exceeding the calyx. 

 Pod pubescent. 



Stipe of the pod two thirds as long to fully as long as the body; leaflets 



linear to oblong, appressed white-silky. 4. P. asymmetrica. 



Stipe of the pod less than half as long as the body; leaflets oval or 



oblong, loosely white-villous. 5. P. leucopsis. 



Pod glabrous. 



