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.........2.-22--22--2----- 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, pearly 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. brandeget. 
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.....2...22.002-2-----------30. P. similis. 
Stems glandular only above. : 
Stems pruinose-puberulent; 
leaves entire.............----29. P. metcalfet. 
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 so0....-...- 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. 
