36 Contributions from the Gray Herbarium 
Key to Species 
A. Inner phyllaries with ampliated and elongated membranaceous or mem- 
eous-chartaceous rounded tips...... . Subg. Amphilepis, p. 45. 
A. Inner phyllaries not ee pag into picadicanacnkin’ or membrane 
roun 
B. Low oe seen with small ovate entire leaves canescent at 
neath, and small heads solitary at tips of — wale be 
jae, p 
B. Herbaceous, or if itary, C. and with small ovate sain sea tele then with 
heads not so 
C. Leaves deeply siiinebe deli: pappus none. 
Ser. Pinnatilobatae, p. 79. - 
ed, D. 
C. Leaves never more than dentate or laciniate-tooth 
D. — 2-seriate, the phyllaries strictly herbaceous; pappus 
Sect. H eliomeris, P: _ 108. 
C6 wee ee 8 Wee 6 Be ole bet pee © ee 64% 

D. Involucre rei the phyll 
se; 8 us usually prese 
E. Snele perennt herbs, very sonal Teatys vane 1 rae revo- 
lute, linear or linear-filiform; Paragu 
Nohophiell p. 176. 
E. Leaves lanceolate or broader or if linear, age stem not very leafy 
Seow in V. oaege- eg of Mexie co, which has blunt or , 
cute phyllaries 
F. simple - scaceetss perennials, with one to few large heads; _ 
rohny lanceolate or lance-ovate, by ved <a “* 
G. ge pens — ae or ts p. ee 
silky or densely pilose-tomentose or lanate 
Moti 
I, Leaves subsessile ay 
J. Leaves very fondle rounded ..... 78.0 omtusifoli 
J. Leaves acute or acutish. 
Leaiee silky-cansaceixt t beneath. 29. V. sessilifolia. 
Leaves pilose-tomentose beneath. - V. discolor. 
I. Leaves rte er-petioled, 
K. Pa ang ar 
1 
Phyllaries ith narrow barby : 
yllaries ovate-based, wi _ TT dentala. 
strongly indurated at base 
iis 
tescent im 
Leaves silky beneath; aed gine oon 4 
durated at base . V. gram: : 
Leaves ioseomenion pent ph: 
H. Leaves not silky or coe pilose-tomentose or lanate ; 
a it 
N. Leaves distinctly petioled (petiole 6 mm. long oF more); : 
O. (See p. 38.) ats ‘ 
