HUMULUS LUPULUS. 
Fruit. Achenium or utricle, surrounded by the membranous 
or fleshy calyx. 
Seeps. Not numerous. 
Tue Seconpary CHARACTERS. 
Humuuus. Calyx five-sepalled. Stamens five. Anthers with 
two pores at the summit. Bracts imbricate, large, entire, 
concave, persistent, one-flowered. Calyx membranous, entire, 
persistent. Styles two. Achenium invested by the thin calyx. 
STAMINATE FLOWERS. Calyx five-leaved. Corolla none. Anthers with two 
pores at the extremity. PisT1LLaTE FLOWERS. Calyx one-leaved, entire, oblique, 
spreading. Styles two. Seed one within the leaf, like calyx. Inflorescence stro- 
bile-form. 
Tue Speciric CHaracters. 
Humvutus Lurutus. Stem long, annual, rough backwards 
with reflexed prickles. Leaves very rough, generally three- 
lobed, deeply cordate at base, on long stalks. Flowers of the 
barren plants extremely numerous, panicled, greenish. Flow- 
ers of the fertile plants in aments with large scales. 
Stem twining with the sun. Leaves lobed. 
Tue Arririciran CHaRacTers. 
* Crass Diacra. Stamens apart from the pistils in different 
flowers upon different plants. Orper Penranpria. Herbs 
exogens, diecious. Fruit a utricle or achenia. Svyles two. 
Leaves rough (often with stings), stipulate. Flowers incon- 
spicuous. 
NATURAL HISTORY. 
In England the hop is an indigenous plant, perennial, 
growing in hedges, and flowering in July. Throughout the 
United States it is found wild in hedges, &c., and is exten- 
sively cultivated for the sake of its fertile aments, which are 
chiefly used as a preservative in malt liquors. : 
| The root sends up many long, striated, angled, rough, flex- 
ible stems, which support themselves by twining round up- 
right bodies in a spiral direction from left to right. The 
leaves are opposite, in pairs, petiolate, heart-shaped, serrated, 
_ entire or lobed, and of a dark-green color on the upper disc. 
oth the leaves and petioles are scabrous, with mi 
nute pric- 
