Cc 
1910] © Fernald & Wiegand,— Erigeron acris 22 
THE REPRESENTATIVES OF ERIGERON ACRIS IN 
NORTHEASTERN AMERICA. 
M. L. FERNALD and K. M. WiEGAND. 
Erigeron acris L. is the type of a small group of plants which has 
one or more representatives in nearly all the boreal districts of the 
northern hemisphere. Until recently members of the group were 
unknown in New England and adjacent Canada, but we now know 
one of them as a frequent plant of clearings and open banks as far 
south as the Rangeley Lakes in western Maine, so near the New 
Hampshire border that the plant may be sought with confidence in 
northernmost New Hampshire; another representative of the series 
has long been known from Labrador but its identity not clearly made 
out, and this plant has recently been found in Quebec south of the 
St. Lawrence; and a third plant, of Anticosti, though represented 
in herbaria, has remained without definite identification until the 
present time. In studying these plants and their affinities the writers 
have found it convenient to draw up the following brief synopsis to 
cover the leading characters. 
* Cauline leaves lanceolate, with smooth or slightly ciliate margins, usually 
much exceeded by the peduncles or the branches of the inflorescence. 
E. Acnuis L. Plant more or less hirsute: inflorescence racemose 
or panieulate, of numerous medium-sized heads (involucres 5-9 mm. 
high): involucral bracts very hirsute.— Sp. Pl. 863 (1753); Gray, 
Syn. Fl. i. pt. 2, 219 (1884), in great part.— Said by Dr. Gray to 
occur in Labrador, but seen by us only from Eurasia and the Rocky 
Mountain region. Represented in the East by 
Var. ASTEROIDES (Andrz. DC. Similar in habit, glabrous or 
only slightly hirsute: peduncles and involucre glandular-puberulent; 
involucral bracts at most a little hirsute at base.— Prodr. v. 290 
(1836). Var. droebachensis Blytt, Norges Fl. i. 562 (1861); Gray, 
Syn. Fl. i. pt. 2, 220 (1884). EF. droebachensis O. F. Muell. Fl. Dan. 
v. pl. 874 (1782). E. asteroides Andrz. ex Besser, Enum. Pl. Vohl. 33 
(1821-22).— Recent clearings, open banks, etc., Gaspé County, 
Quebec, to Alaska, south to southern New Brunswick, northern 
Maine, northern Michigan, Colorado, Utah, and Oregon; also Eura- 
sia. In the Northeast known as far south as the Kennebeckasis 
River, New Brunswick (Norton, coll. Hay), the Mattawamkeag 
River, Maine (Crystal, coll. Fernald), and the Rangeley Lakes, Maine 
(Kennebago Lake Trail, coll. Miss Furbish). 
