Genus i. 



HEMP FAMILY. 



6 33 



Family 10. CANNABINACEAE Lindl. Veg. Kingd. 265. 1847. 



Hemp Family. 



Annual or perennial herbs, the stems erect or twining. Leaves opposite or 

 sometimes alternate, toothed, lobed, or divided, petioled, the stipules persistent. 

 Flowers dioecious ; staminate flowers in panicled racemes, usually 5-parted ; 

 pistillate flowers in bracted spikes, the perianth entire, the ovary 1 -celled, the 

 styles or stigmas 2, the ovule pendulous. Fruit an achene, with crustaceous 

 pericarp. Endosperm fleshy ; embryo curved or coiled. 



Twining vines; pistillate flowers in araent-like clusters. i. Humulus. 



Erect, tall herbs ; pistillate flowers spicate. 2. Cannabis. 



1. HUMULUS L. Sp. PI. 1028. 1753. 



Twining herbaceous perennial rough vines, with broad opposite thin petioled palmately 

 veined serrate 3-7-lobed or undivided leaves, lanceolate membranous persistent stipules, 

 and dioecious axillary flowers, the staminate panicled, the pistillate in ament J like drooping 

 clustered spikes. Staminate flowers with a 5-parted calyx, the segments distinct and imbri- 

 cated, and 5 short erect stamens. Pistillate flowers in 2's in the axil of each bract of the 

 ament, consisting of a membranous entire perianth, clasping the ovary, and 2 filiform cadu- 

 cous stigmas. Fruiting aments cone-like, the persistent bracts subtending the compressed 

 ovate achenes. Embryo spirally coiled. [Name said to be the diminutive of the Latin 

 humus, earth.] 



Two species, widely distributed through the north temperate zone. Type species : Humulus 

 Lupulus L. 



1. Humulus Lupulus L. Hop. Fig. 1554. 



Hamulus Lupulus L. Sp. PI. 1028. 1753- 



A dextrorsely twining or prostrate vine, often 

 25 long, very rough with stiff reflexed hairs. Leaves 

 orbicular or ovate in outline, slender-petioled, 

 deeply 3-7-cleft or some of the upper ones ovate, 

 acute and merely serrate ; petioles i -3' long ; stipules 

 reflexed, ovate or lanceolate, acuminate, 4"-i2" long; 

 panicles of staminate flowers 2-5' long; ripe pistil- 

 late clusters (hops) i'-2*' 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 Mani- 

 toba, south to southern New York, Pennsylvania, Georgia, 

 Kansas, Arizona and New Mexico. Extensively escaped 

 from cultivation. Native also of Europe and Asia. July- 

 Aug. Fruit ripe Sept.-Oct. 



Humulus japonicus Sieb. & Zucc, the Japanese hop, 

 with deltoid acuminate, not resinous, bracts, has escaped 

 from cultivation from Connecticut to New Jersey. 



2. CANNABIS (Tourn.) L. Sp. PI. 1027. 1753. 



A stout erect rough and puberulent herb, with alternate and opposite petioled digitately 

 S-n-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. Embryo curved. [The classic name 

 of hemp.] 



A monotypic genus of central Asia. 



