134 THE JOURNAL OF BOTANY 
immediately beneath the flower, and there is a tendency for the 
secondary laterals to pom the eng, branches unilaterally. 
Our observations have been based for the most part on the 
study of living specimens of iis pesca variky of the American 
hop known as the Oregon ‘Cluster,’ obtained in 1908 from 
Aagiettael ites Wee , Kent. "'Herbari rium specimens have 
also been consulted. Nuttall’s sg rs ee is now in the ee 
ment of Botany, British Museum, but does not contain A. a 
canus. Nuttall sent plants to Hecke teow 1898 ¢ to 1858, sad 3 in 
Hooker’s herbarium at aed there is a specimen ec “ Nuttall 
from Gambell, Californ This is a small portion of a female 
plant, and in its leaf-characters ea the reflexed stipules agrees 
with rE Oregon “ Cluster” plants. 
s to be noted that botanists, e.g. Britton & Brown, l.c., 
and Britton i in his wins wal (1901), while referring the American 
plant to H. Lupulus, describe the stipules as reflexed. 
While there seems to be no doubt that H. americanus is truly 
indigenous to America, it appears that cultivated varieties of H. 
Lupulus imported from Europe spss 2m England) for culti- 
vation by the hop-grower are ope peeetiag iii “wild” in 
America. Asa Gray says, in the American Draggist » p. 111 (1886) 
(see Braungart, Der Hoppen, 147 (1901) ), that in his vee all 
so-called wild hops in North America came origin om the 
plants which have been brought from Europe, and that ThGoe grow 
truly wild in America only on the banks of certain rivers of Ndcer 
Canada to New Mexico, probably also in Arizona. Britt 
p els. 
& Cockerell (Proe 1 Biol. Soc . Wash., 16 : 45 (1908) ge: 8 
deeper divided leaves, shoul apparently be placed under 
anus. J. M. Coulter (New Man. Bot. Central Rocky Mountains 
p. 144 Sees stated _ this variety ‘is the comm 
trkao and New Mexico”; and P. A. Rydberg (Fi. chads, 
p- 100 (1906) ) refers to it a as “the native hop of the Rocky Moun 
tain region,” and states that it “has deeper divided leaves nd 
more sharply acuminate bracts than the cultivated variety.’ 
A further a, of ie americanus deserves notice, as it 
po ag — “nine o be of specific importance—that is, its 
. The aroma of the “ Clusty ” hop grown either in America 
oF in in this esaskes is so distinctive, thes a single “ Maite (strobile) 
n be immediately detected among the “ hops ”’ of any oe 
Ciaseneais form of H. Lupulus. This distinctive aroma has 
— by one of us (i. S. Salm eee on Hops, 1912-14, 
p- 29 (1914)) to the “ ete cu aan ” aroma; Dr. J. Schmidt 
(Comptes-rendus Lab. Carlsberg, ae 155 (1915) ) says of it: “ the 
aroma in question is, I should say, rather much like that of tur- 
pentine, with a touch of sticking. faintly resommbling the aromatic 
