638 Ordeb 116.— EMPETRACJLE. 



short petioles ; upper spikes long and Bterile, lower short, dense, fertile. — Borders 

 of ponds, S. W. States. St. strict, 2 to 3f high, very rough. Lvs. 3 to 5' long, a 

 fourth as wide, thicif, on petioles 4 to 7'' long. Fertile spikes as long as the pet- 

 ioles, sterile nearly as long as the leaves. 



5. PARIETA^RIA, Tourn. Pellitory. (Lat. paries, a wall ; some 

 of the species prefer to grow on old walls.) Flowers inonoecio-polyga- 

 mous, in clusters, surrounded by a many-bracted involucre. $ Calyx 

 4-.sepaled ; stamens 4, at first incurved, elastically expanding. ? Calyx 

 tubular-campanulate, 4-lobed, inclosing the ovary; stigma tufted ; ache- 

 nium polished, inclosed within the persistent calyx. — Herbs weed-like, 

 with usually alternate lvs. Clusters of green fls., axillary. 



1 P. Pennsylvdnioa Muhl. Lvs. oblong-lanceolate, veiny, tapering to an oiiuse 

 point, entire, punctate -with opaque dots ; invol. longer than the flowers. — (D A 

 rough, pubescent herb, found in damp, rocky, places, Vt. to Wis. and Ga. Stem 

 erect, simple or sparingly branched, 6 — 12' high. Leaves alternate, entire, hairy 

 and rough, about ^' wide and 3 or i times as long, petiolate, and ending with an 

 obtuse acumination. Segments of the involucre about 3, lance-linear. Flowers 

 dense, greenish and reddish white. May, Juno. 



2 P. Ploridana Nutt. Lvs. roundish-ovate, obtuse, as long as the petiole, opaquely 

 punctate ; fls, as long as the involticre. — Q Damp, sandy soils, Ga. and Fla. St 

 decumbent at base, branches erect, 10 to 12' high. Lvs. small, 1' long, including 

 the filiform psttole, 3 to 5" wide. Bracts linear. May — Oct. 



6. HU'MULUS, L. Hop. (Lat. humus, moist earth ; the hop grows 

 only in rich soils.) Flowers $ $ . — $ Calyx 5-sepaled ; stamens 5 ; 

 anthers with 2 pores at the summit. ? Bracts imbricate, large, entire, 

 concave, persistent, 1-flowered, forming an oblong ament ; calyx of 1 

 sepal; membranous, entire, persistent; styles 2; achenium invested by the 

 thin calyx; embryo coiled. — If Twining with the sun. Lvs. opposite. 

 Fls. in axillary panicles and strobile-like aments. 



H. liipulus L. The hop-vine is found wild in hedges, &c., throughout this country, 

 and is, as every one knows, extensively cultivated for the sake of its ament-liko 

 fruit. It has a long, annual stem of rapid growth, always twining with the sun, 

 rough backwards with reflexed prickles. Leaves very rough, generally 3-lobed, 

 deeply cordate at base, on long stalks. Flowers of the barren plants innumer- 

 able, panicled, greenish ; those of the fertile, in aments with large scales. Cal. 

 and scales in fruit covered with reddish, resinous atoms (lupulin) in which the 

 virtue resides. Jl. 



7. CAN'NABIS, Tourn. Hemp. Flowers 3 $ •— <5 Calyx 5-parted ; 

 stamens 5. $ Calyx entire, oblong-acuminate, opening longitudinally 

 at the side ; styles 2 ; caryopsis 2-valved, inclosed within the persistent 

 calyx ; embryo curved. Q Lvs. opposite, digitate. Fls. axillary, $ in 

 cymous panicles, $ in sessile spikes. 



C. sativa L. Lvs. palmately 5 to l-foliate. — The hemp springs up spontaneously 

 in our hedges and waste grounds. It is a tall, erect plant, with handsome petio- 

 late leaves. Lfts. lanceolate, serrate, 3 to 5' long, ^ as wide, the middle one 

 largest. Fls. small, green, solitary and axillary in the barren plants, spiked in 

 the fertile ones. It is cultivated in Ky., Tenn., &c., as one of the staples. Jn. 

 § India. 



Order CXVL EMPP:TRACE^. Crowbeeeies. 



Shrttis }q}v, evergreen, heathlike, with crowded, narrow leaves and small, diclin- 

 OU3 flowers. Calyx of -4 to 6, hypogynoua, persistent, imbricated scales, the inner 

 oiten colored. Stamens 2 or 3, pollen grains quaternate. Ovary free, 2 to 9-celled, 



