676 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
Bracts appressed except at the very tips; rays 
narrow; pappus usually double. 
Rays white; pappus uniseriate.............- 32. 
Rays lavender to deep purple; pappus double. 
Upper cauline leaves reduced, linear-lance- 
olate; none of the leaves 3-nerved; pe- 
duncles long, erect. 
Leaves canescent..........cceeccececcee 33. 
Leaves glabrous or nearly so, or merely 
ciliate, never canescent. 
Involucres glandular-puberulent, spar- 
ingly if at all hairy. 
Stem with long white hairs through- 
out; lower leaves hairy.......... 34. 
Stem glabrous below, glandular-pu- 
berulent above; leaves glabrous.35. 
Involucres densely hirsute, villous, or 
strigose. 
Stems villous throughout; plants low, 
usually 20 cm. high or less... ... 36. 
Stems glabrous below, usually much 
more than 20 cm. high. 
Disk more than 15 mm. broad; 
heads solitary or very few..... 37. 
Disk less than 12 mm. broad; heads 
more numerous..........--.... 38. 
Upper cauline leaves ample, not much 
smaller than the lower, lanceolate to 
ovate; lower leaves 3-nerved; peduncles 
short, ascending. 
Leaves glabrous, smooth to the touch, 
sometimes ciliate. 
Basal leaves broadly obovate-spatulate, 
often denticulate; cauline leaves 
distant, shorter than the inter- 
nodes, not ciliate................. 39. 
Basal leaves oblanceolate, entire; cau- 
line leaves more numerous, longer 
than the internodes, usually ciliate. 
Bracts glandular-puberulent, not at 
all hirsute... .......22.20..02.. 40. 
Leaves more or less pubescent, rough to 
the touch. 
Leaves densely canescent, grayish... .42. 
Leaves not canescent, green. 
Stems hirsute throughout. 
Upper leaves ovate to oblong, 
mostly obtuse................ 43. 
Upper leaves lanceolate, very 
ACUTE... 2.2... eee ee ee ee 4. 
Stems not hirsute, at least below. 
Upper leaves broadly lanceolate, 
scaberulous; stems puberulent .45. 
FE. rusbyi. 
E.. deminutus. 
EF. viscidus. 
E. smithii. 
E. pecosensis. 
E. formosissimus. 
E.. glabellus. 
E. superbus. 
E.. macranthus. 
. HE. speciosus. 
E. subtrinervis. 
E. platyphyllus. 
E. rudis. 
E.. semirasus. 
