WOOTON AND STANDLEY FLORA OF NEW MEXICO. 581 



Calyx lobes attenuate or abruptly acu- 

 minate; inflorescence glandular or 

 glabrous, open or dense. 

 Inflorescence glandular; flowers few, 



remote . . .20. P. gracilis. 



Inflorescence not glandular; flowers 



numerous, dense 22. P. rydbergii. 



Corolla decidedly funnelform, the throat 

 much wider than the tube. 

 Sterile stamen glabrous. 

 Sepals long-attenuate, villous; most of 



the leaves denticulate 23. P. whippleanus. 



Sepals merely acute to truncate, not 

 attenuate, nearly glabrous; leaves 

 dentate or entire. 



Stems puberulent; sepals acute 24. /'. virgatus. 



Stems glabrous; sepals acute to trun- 

 cate. 



Sepals obtuse or truncate 25. P. neomexicun us. 



Sepals attenuate or abruptly acu- 

 minate. 

 Anthers short-hirsute; pedicels 

 pubescent; inflorescence very 

 dense; upper leaves ovate or 



cordate 2G. P. brandegi i. 



Anthers glabrous; pedicels gla- 

 brous; inflorescence open; 



upper leaves lanceolate 27. P. unilateralis. 



Sterile stamen bearded. 

 Stems glandular, at least about the in- 

 florescence; plants seldom glau- 

 cous. 



Steins glabrous below 28. /'. stenosepalus. 



Stems pubescent throughout. 

 Steins densely glandular through- 

 out 30, /'. similis. 



Stems glandular only above. 

 Stems pruindse-p u be r u 1 <• n t ; 



leaves"entire 29. /'. metcalft i. 



Stems hirsute; leaves evidently 



serrate.. 31. P. pulchellus. 



Stems glabrous throughout; plants glau- 

 cous. 

 Bracts of the inflorescence mostly 

 longer than the flowers; basal 



leaves linear or nearly so 32. /'. caud 



Bracts shorter than the flower basal 

 Leav< a spat ulate or obi in< • olate 

 Bracts ovate to nearly orbicul a. . . .33. P. cyathophoru*. 

 Bracts lanceolate or lineai I 

 late. 



Calyx lobes lanceolate 34. P. at cund\flonu, 



Oalya lobes o 1 tte S leri. 



