OBTICACE.E, 



355 HUMDLUS. 



Three or four other species are described by aiithors as natives of the 

 Northern States, but on careful examination they will probably be found mere 

 varieties of some of the foregoing species. 



2. PARIETA'RIA. 



Flowers monoecious-polygamous, in clusters surrounded by 

 a many-cleft involucre; calyx 4-parted ; stamens 4, at first 

 incurved, then expanding with an elastic force; ovary and 

 style 1 ; achenium polished, enclosed within the persistent 

 calyx. 



Lat. paries, a wall ; some of the species prefer to grow upon old wall?, «fcc. 

 Herbs, with a watery juice and usually with alternate leaves. Clusters 

 axillary. 



P. Pennsylva'nica. 



Xcfl?;e5 oblong-lanceolate, veiny, tapering to an obtuse point, punctate with 

 opaque dots ; i«co/('c;-c longer than the flowers. A rough, pubescent herb, 

 found in damp, rocky places, Vt. and N. Y. Stem erect, simple or sparingly 

 branched, G — 12 inches high. Leaves alternate, entire, hairy and rough, 

 about I inch wide and 3 or 4 times as long, petiolate, and ending vi'ith an 

 obtuse acumination. Segments of the involucre aboutS, lance-lineur. Flow- 

 ers dense, greenish and reddish- white. Rare. Jn. Ann. Pellitory. 



3. CA'NNABIS. 

 Flowers dioecious. Sterile. — Calyx 5-par(ed. Fertile. — 

 Calyx entire, oblong, acuminate, opening longitudinally at the 

 side; styles 2; achenium? 2-valved, enclosed within the per- 

 sistent calyx. 



Arabic ganeb, hemp. Annual herbs with watery juice. Lvs. opposite, 

 digitate. Fls. axillary, in cymose panicles or sessile. 



C. S.\Tl'VA. 



Leaves palmately 5 — 7-foliate. The hemp was introduced, originally from 

 India, but it springs up spontaneously in our hedges and waste grounds. It 

 is a tall, erect plant, with handsome petiolate leaves. Leaflets lanceolate, 

 serrate, 3 — 5 inches long, one fifth as wide, the middle one the largest. 

 Flowers small, green, solitary and a.xillary in the barren plants, spiked in the 

 fertile ones. It is cultivated in many countries for the sake of its fibre which 

 is stronger than that cf flax, and is the best of all materials for cordage and 

 sail-cloth. The seeds are nutritious, but the leaves are stimulant and narcotic, 

 producing intoxication. June. Hemp. 



4. HU'MULUS. 



Flowers dioecious. Sterile. — Calyx 5-sepaled; stamens 5 ; 

 anthers with 2 pores at the summit. Feitile. — Bracts imbri- 

 cate, large, entire, concave, persistent, 1-flowered ; calyx 

 membranous, entire, persistent; styles 2; achenium invested 

 by the thin calyx. 



Lat. /n(m7/y, moist earth ; as the hop grows only in rich soils. Perennial 

 herbs, twining with the sun. Juice vi^atery. Lvs. opposite. Fls. in axillary 

 panicles and pedunculated aments. 



