388 Compositaceae 
ERIGERON FLEA-BANE 
Herbs but often shrubby at base, annual or biennial or perennial. Leaves entire 
to dissected. Heads |—many, radiate or rayless, many-flowered, corymbose or cymose ur 
paniculate; involucre-bracts usually equal, narrow, in 1—2 series; receptacle flat, punc- 
tate. Ray-flowers none or usually many, usually in more than | series, various in color. 
Disk-flowers mostly perfect. Akenes somewhat flat, usually pubescent, often with 2 lat- 
eral veins. Pappus of bristles; bristles scabrous, capillary, in | or 2 whorls; single whorl 
or inner whorl of scabrous capillary bristles; outer whorl of minute bristles or small awn- 
tipped scales. (Gk. er—spring, geron—an old man; some early species are very hoary.) 
A. Rays conspicuous, much surpassing the disk-flowers. 
B. Rays yellow. 
Leaves spatulate to obovate ; heads solitary. 
D. Stem 4—10 cm. high. 
E. Leaves 2.5—7.5 cm. long. E. 
E. chrysopsidis Gray 
EF. Leaves 1—1.5 cm. long. E. 
E, chrysopsidis brevifolius Pip. : 
DD. Stems 20—30 cm. high; leaves 1.2—1.6 cm. long. C. E. (Stenotus 
brandegei. ) E. aurens Gr. 
CC. Leaves linear; heads | to several. 
F. Involucre-bracts equal; rays ochroleucous. E. 
E. ochroleucus Nutt. 
FF.  Involucre-bracts unequal; rays yellow. 
G. Leaves hispidulous, curved; rays pale yellow. E. (E. curvifolius.) 
E. luteus Nels. 
GG. Leaves canescent-puberulent, straight; rays bright-yellow. E. (E. 
peucephyllus. ) E. filifolius Nutt. 
BB. Rays not yellow. 
Leaves entire to serrate or dentate. 
I. Stems simple below tho often branched above, solitary. 
J.ootays 100-150. 
K. Leaves entire; involucre somewhat hirsute; stem from a woody peren- 
nial base. 
L. Herbage glabrous or very nearly so; heads 1.5—-2 cm. wide. W. 
Cc E. speciosus DC. (Pretty Flea-bane) 
LL. Herbage plainly pubescent; heads 2.53.5 cm. wide. E. 
E. subtrinervis Rydb. (3-veined Flea-bane) 
KK. Leaves dentate; involucre glabrous; stem not woody at base, peren- 
nial by stolons. W. C. E. 
E. philadelphicus 1y, (Philadelphia Flea-bane) 
JJ. Rays 20—70. } 
Involucre viscid or glandular. 
N. Upper leaves ovate-oblong to lanceolate; involucre 12—16 mm. 
wide. C. E. (E. membraneous; E. saluginosus angustifolius. ) 
E. saluginosus Gray 
NN. Upper leaves oblanceolate to spatulate; involucre 6—8 mm. 
wide. U. E., cervinus Gr. 
MM. | Involucre not viscid nor glandular. 
O. Heads solitary or few; perennial; pappus a single whorl of bristles. 
P. Rays 50—60, sometimes white. W. (E. amplifolius.) 
E. aliceae How. 
