URTICACEAE. 34 1 



fiten deeply 3-lobed, sometimes witli a lobe on one sids only, as in Sassafras, 

 ixely 5-lobed, rough above, tomentose beneath, 1—2 dm. long; spikes of staminate 

 Dwers peduncled; heads of pistillate flowers 1-2.5 cm. in diameter. Escaped 

 om cultivation, N. Y. to Ga. and Mo. May-June. 



4. HUMULUS t. (See Appendix.) 



Herbaceous perennial rough vines, with broad opposite thin petioled palmately 

 iined leaves, lanceolate membranous stipules, and dioecious axillary flowers, the 

 aminate panicled, the pistillate in ament-like drooping clustered spikes. Stam- 

 iate flowers with a 5 -parted calyx, the segments distinct and imbricated, and 5 

 lort erect stamens. Pistillate flowers in 2's in the axil of each bract of the ament. 

 msisting of a membranous entire perianth, clasping the ovary, and 2 filiform 

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

 )mpressed ovate achenes. Endosperm fleshy. Embryo spirally coiled. [Name 

 dd to be the diminutive of the Latin /iutm<s, earth.] Two species, the following 

 idely distributed through the north temperate zone, the other native of north- 

 istern Asia. 



1. Humulus Lvipulus L. Hop. (I. F. f. 1261.) A vine, often 8 m. long, 

 ;ry rough with stiff reflexed hairs. Leaves orbicular or ovate in outline, slender- 

 itioled, deeply 3-7 -cleft or some of the upper ones ovate, acute and merely ser- 

 ite; stipules reflexed, acuminate, 8-25 mm. long; ripe pistillate clusters (hops) 

 5-6 cm. long; fruiting bracts broadly ovate, concave, thin, glabrous or nearly 

 >, obtuse, much longer than the achenes; fruiting calyx and achene strongly 

 isinous-aromatic. In thickets and on river-banks, N. S. to Manitoba, N. Y., 

 enn., in the Alleghanies to Ga., to Kans., and in the Rocky Mts. to Ariz, and 

 . Mex. Extensively escaped from cultivation. Native also of Europe and Asia. 

 lly-Aug. Fruit ripe Sept. -Oct. 



5. CANNABIS L. 



A stout, rough and puberulent herb, with petioled digitately 5-11-divided thin 

 aves, subulate stipules, and greenish dioecious axillary flowers, the staminate 

 anicled, the pistillate spicate. Staminate flowers with a 5 -parted calyx, the 

 :pals distinct and imbricated, and 5 short stamens. Pistillate flowers solitary in 

 le axils of foliaceous bracts, consisting of a thin entire calyx clasping the sessile 

 fary, and 2 filiform caducous stigmas. Fruit a compressed achene. Endosperm 

 ;shy; embryo curved. [The classic name of hemp.] A monotypic genus of 

 mtral Asia. 



1. Cannabis sativa L. Hemp. (I. F. f. 1262.) Annual, branching, 1-3 m. 

 11, the inner fibrous bark very tough. Leaves divided to the base, the segments 

 nceolate or linear-lanceolate, acuminate at both ends, sharply and coarsely ser- 

 te, 0.7-1.5 dm. long; staminate panicles narrow, loose, peduncled; pedicels 

 form, bracteolate, 2-6 mm. long; pistillate spikes erect, leafy-bracted; achene 

 ustaceous, ovoid-oblong, about 4 mm. high. In waste places, N. B. to Ont., 

 inn., N. Car., Tenn. and Kans. July-Sept. 



Family 3. URTICACEAE Reichenb. 

 Nettle Family. 



Herbs (some tropical species shrubs or trees), with watery sap, 

 ostly stipulate simple leaves, and small greenish dioecious, monce- 

 ous or polygamous flowers, variously clustered. Calyx 2-5-cleft, 



of distinct sepals. Petals none. Stamens in the staminate flowers 



many as the lobes or segments of the calyx (sepals) and opposite 

 em, the filaments inflexed and anthers reversed in the bud, straighten- 

 g at anthesis. Ovary superior, 1 -celled ; style simple; ovule solitary, 

 ect or ascending, orthotropous, or in some genera partly amphitro- 

 >us. Fruit an achene. Endosperm oily, usually not copious; embryo 

 raight. About 40 genera and 475 species of wide geographic dis- 



bution. 



