N. ORD.—URTICACEZ:. foe 
S. ORD.—CANNABINEA. 
GENUS.—HUMULUS,* LINN. 
SEX, SYST.—DIGECIA PENTANDRIA. 
LUPULUS. 
HOPS 
SYN.—HUMULUS LUPULUS, LINN.; H. AMERICANUS, NUTT. 
COM. NAMES.—COMMON HOP, NORTHERN VINE; (FR.) HOUBLON; (GER.) 
HOPFEN. 
A TINCTURE OF THE STROBILES OF HUMULUS LUPULUS, LINN. 
Description.—This rough, twining perennial, grows to a height of 20 feet or 
more. Aootstalk large, thick, and branching; s¢ems several from the same root, 
slender, solarly voluble, almost prickly downward. Leaves longer than the petioles, 
mostly opposite, and cordate, the upper neither lobed nor cleft, the lower palm- 
ately 3- to 5-lobed, all coarsely serrate, sharply pointed, and very rough, the 
roughness most resistant from the periphery inward; stipules at first erect, then 
reflexed, ovate, persistent, interpetiolar, the adjacent ones of each opposite pair 
confluent at their bases. lowers dicecious. Fertile flowers in short axillary and 
solitary, sessile catkins ; érac¢s ovate, acute, smoothish, foliaceous, and imbricated, 
each 2-flowered ; calyx of a single sepal embracing the ovary ; ovary ovoid, smooth, 
1-celled; ovudes solitary, pendulous; styles 2, very hairy, much longer than the ovary. 
Sterile flowers in lax, divaricate, axillary panicles; sepals 5, oblong, obtuse; stamens 5, 
opposite the sepals; //aments very short; anthers erect, oblong, linear, and apicu- 
late, opening by two terminal slits. /vzz¢ (!) a membranaceous, cone-like catkin 
or strobile, consisting of the whole female inflorescence now enlarged and scale- 
like ; achenium, or true fruit, seed-like, subglobular, invested with a large scalaceous 
calyx (the enlarged bractlet); the true fruits and calices sprinkled with yellow, 
resinous, globular, and top-shaped grains (Lupulin). Seeds solitary, pendulous ; 
testa thin; embryo coiled in a flat spiral. 
History and Habitat.—The Hop is found wild, and is indigenous throughout 
Europe, except its most northern country, from whence it extends eastward 
through Central Asia to the Altai Mountains. In North America it is without 
doubt indigenous northward and westward, where it grows in alluvial soils, blos- 
soming in July, and fruiting in September. oe 
* From humus, damp, the habitat being alluvial soils. 
+ Anglo-Saxon, Aoppan, to climb. 
