428 Compositaceae 
MM. Heads 2.5—-3 cm. high. E. A. grandiflora Gr. 
LL. Apex of akene abruptly contracted; beak 20—25 mm. long. U. E. 
A. retrorsa Gr. 
KK. Annual; heads |—18 cm. high; beak of akene 6—8 mm. long. E. (A. 
heterophylla varieties. ) A. heterophylla Gr. 
CREPIS HAWK’S-BEARD 
Annual or perennial, stems leafy or scape-like, simple or branched. Leaves some- 
times all basal, entire to pinnatifid. Heads solitary or paniculate, few to many-flowered; 
principal involucre-bracts in | series, equal, with a number of smaller ones outside; recep- 
tacle naked or short-fringed. Corolla yellow. Akenes columnar to fusiform, 10—20- 
ribbed or -veined, not transversely rugose, narrowed at base and apex. Pappus bristles 
capillary, many, white, usually soft. (Gk. krepis—a sandal. Why?) 
A. Leaves glabrous. 
B. Plant with running rhizomes, glaucous; stems 2—} cm. high; leaves entire or 
wavy; akenes with discoid dilation at the insertion of the pappus. W. C. 
C. nana Rich. 
BB. Plant without rhizomes, mostly not glaucous; stem 3—-9 dm. high; leaves or 
some of them laciniate-pinnatifid, rarely entire; akenes not dilated at the insertion 
of the pappus. 
C. Stem leafless or very nearly so. 
D. Involucre ashy-pubescent, 12—18 mm. high. E. 
C. andersoni Gray 
DD. Involucre glandular-pubescent, 8—12 mm. high. E. (C. platyphylla.) 
C. runcinata T. & G. 
CC. Stem leafy; stem-leaves clasping. W. 
GC. virens L. (Smooth Hawksbeard) 
AA. Leaves puberulent to tomentose. 
E. Involucre glandular-hairy. 
F. Leaves oblong to lanceolate in general outline. 
G. Pubescence not of long brown glandular-hairs. 
H. Stems scape-like, branched but with bract-like leaves, whole plant glandu- 
lar; BE C. runcinata hispidulosa How. 
HH. Stems not scape-like, branched and with unbract-like leaves, not gland- 
ular below. W.C. E. (Apparently C. atrabarba.) 
C. occidentalis Nutt. 
GG. Pubescence of long brown glandular hairs. U. E. 
C. monticola Cov. 
FF. Leaves spatulate to oblanceolate in general outline. E. 
C. subcarnosa Gr. 
EE. Involucre glabrous, of 5—8 principal bracts. E. 
C. acuminata Nutt. 
EEE.  Involucre hairy but not glandular, 
I. Involucre bracts without stiff bristles on the back. 
J. Plant merely ashy-puberulent. E. (C. gracilis.) 
C. intermedia Gray 
JJ. Plant tomentose and sometimes also hirsute. 
K. Plant without black hairs among the white ones. 
L. Plant without stiff hairs among the woolly ones, 8—12 cm. high. E. 
C. glareosa Pip. . 
LL. Plant with stiff hairs among the woolly ones, 10—40 cm. high. E. 
C. rostrata Cov. 
