SCIENTIFIC PAPERS. 
A REVISION OF THE AMERICAN SPECIES OF EPILOBIUM 
OCCURRING NORTH OF MEXICO. 
BY WILLIAM TRELEASE. 
In addition to species which have been singly described 
in various papers, and those treated in more restricted floras, 
the North American representatives of the genus E’pilobium 
have been comparatively described by De Candolle,* 
Torrey and Gray,f and Haussknecht.{ The first and last 
of these accounts include general monographs of the genus. 
The second, enriched by manuscript descriptions by Nut- 
tall, has the same scope as the following revision, but 
of necessity refers to a smaller area of well-explored terri- 
tory. The more notable works of more limited range 
which deal with North American representatives of the 
genus are Hooker’s Flora Boreali-Americana (the first vol- 
ume of which bears the date 1840, although the first part 
was issued in 1829 and the second and third parts before 
the end of 1832), and Brewer, Watson and Gray’s Botany 
of California (the first volume of which was published in 
1876). Both refer chiefly to west-coast species. In the 
former,] E'pilobium is treated by Lehmann ; in the latter, § 
by Barbey, who subsequently published excellent illustra- 
tions of the species described there as new. || 
The following pages contain the results of such study as 
* Prodromas, iii. 1828, p. 40 e¢ seq. 
t Flora of North America, i. 1840, p. 486 et seq. 
$ Monographie der Gattung Epilobium, 1884, p. 237 et seq. 
T 1832, p. 204 et seq. § 1876, p. 218 e¢ seg. 
[| Epilobium genus a cl. Ch, Cuisin illustratum, 1886, 
69 
