WOOTON AND STANDLEY FLORA OF NEW MEXICO. 681 



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 



niimerous, dense 22 . P. rydhergii. 



Corolla decidedly funnelform, the throat 

 much wider than the tube. 

 Sterile stamen glabrous. 



Sepals long-attenuate, villous; most of 



the leaves denticulate 23. P. whippleaniis. 



Sepals merely acute to tnincate, not 

 attenuate, nearly glabrous; leaves 

 dentate or entire. 



Stems puberulent; sepals acute 24. P. virgatus. 



Stems glabrous; sepals acute to trun- 

 cate. 



Sepals obtuse or truncate 25. P. neomexicanus. 



Sepals attenuate or abruptly acu- 

 minate. 

 Anthers short-hirsute; pedicels 

 pubescent; inflorescence very 

 dense; upper leaves ovate or 



cordate 26. P. brandegei. 



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. 



Stems glabrous below 28. P. stenosepalus. 



Stems pubescent throughout. 



Stems densely glandular- through- 

 out 30. P. similis. 



Stems glandular only above. 



Stems pruinose-p u b e r u 1 e n t ; 



leaves entire 29. P. metcalfei. 



Stems hirsute; leaves evidently 



sen-ate 31. P. pulchellns. 



Stems glabrous throughout; plants glau- 

 cous. 

 Bracts of the inflorescence mostly 

 longer than the flowers; basal 



leaves linear or nearly so 32. P. caudatus. 



Bracts shorter than the flowers; basal 

 leaves spatulate or oblanceolate. 



Bracts ovate to nearly orbicular 33. P. cyathophorus. 



Bracts lanceolate or linear-lanceo- 

 late. 



Calyx lobes lanceolate 34. P. secundiflorus. 



Calyx lobes ovate 35. P. fendleri. 



