MORACEAE. 
1. Humulus Lupulus 1. Hop. 
(Fig. 1261.) 
Humulus Lupulus I. Sp. Pl. 1028. 1753. 
A dextrorsely twining or prostrate vine, often 25° 
long, very rough with stiffreflexed hairs. Leaves or- 
bicular or ovate in outline, slender-petioled, deeply 
3-7-cleft or some of the upper ones ovate, acute and 
merely serrate; petioles %’-3’ long; stipules re- 
flexed, ovate or lanceolate, acuminate, 4’/-12’/ 
long; panicles of staminate flowers 2’—5’ long; ripe 
pistillate clusters (hops) 1-24’ long; fruiting bracts 
broadly ovate, concave, thin, glabrous or nearly 
so, obtuse, much longer than the achenes; fruiting 
calyx and achene strongly resinous-aromatic. 
In thickets and on river-banks, Nova Scotia to Man- 
itoba, south to southern New York, Pennsylvania, in 
the Alleghanies to Georgia, to Kansas, and in the 
Rocky Mountains to Arizona and New Mexico. Ex- 
tensively escaped from cultivation. Native also of 
Europe and Asia. July-Aug. Fruit ripe Sept.—Oct. 
5. CANNABIS L. Sp. Pl. 1027. 1753. 
A stout erect rough and puberulent herb, with alternate and opposite petioled digitately 
5-11-divided thin leaves, persistent subulate stipules, and greenish dioecious axillary flowers, 
the staminate panicled, the pistillate spicate. Staminate flowers with a 5-parted calyx, the 
sepals distinct and imbricated, and 5 short stamens. Pistillate flowers solitary in the axils 
of foliaceous bracts, consisting of a thin entire calyx clasping the sessile ovary, and 2 fili- 
form caducous stigmas. Fruit a compressed achene. Endosperm fleshy; embryo curved. 
[The classic name of hemp. ] 
A monotypic genus of central Asia. 
1. Cannabis sativa Ll. Hemp. 
(Fig. 1262.) 
Cannabis sativa I, Sp. Pl. 1027. 1753. 
An annual branching herb, 3°—-ro° tall, the inner 
fibrous bark very tough, the branches nearly erect. 
Leaves divided to the base, the segments lanceo- 
late or linear-lanceolate, acuminate at both ends, 
sharply and coarsely serrate, 3/—6’ long, 14-1’ wide; 
staminate panicles narrow, loose, peduncled, 3/—5’ 
long; pedicels filiform, bracteolate, 1//-3’’ long; 
pistillate spikes erect, leafy-bracted, 1’ long or less 
in fruit; achene crustaceous, ovoid-oblong, about 
2// high. 
In waste places, New Brunswick to Ontario and 
Minnesota, south to North Carolina, Tennessee and 
Kansas. Widely distributed in all temperate regions 
through cultivation, and occasionally a troublesome 
weed. Native of Europe and Asia. July—Sept. 
Family 10. URTICACEAE Reichenb. Consp. 83. 1828. 
NETILE FAMILY. 
Herbs (some tropical species shrubs or trees), with watery sap, alternate or 
opposite mostly stipulate simple leaves, and small greenish dioecious, monoe- 
cious or polygamous flowers, variously clustered. Calyx 2—-5-cleft, or of distinct 
sepals. Petals none. Stamens in the staminate flowers as many as the lobes 
or segments of the calyx (sepals) and opposite them, the filaments inflexed and 
anthers reversed in the bud, straightening at anthesis. Ovary superior, 1-celled; 
style simple; stigma capitate and penicillate, or filiform; ovule solitary, erect or 
ascending, orthotropous, or in some genera partly amphitropous. Fruit an 
achene. Endosperm oily, usually not copious; embryo straight. 
About 4o genera and 475 species of wide geographic distribution. 
