Calyx of 3 or 4 equal sepals; stamens 3 or 4. Calyx of 3 oblong, unequal sepals; stamens rudiments 3, cucullate opposite the sepals; achenium roughened, opaque, ovate, erect, nearly naked. - Smooth, stingless, with opposite lvs., united stipules and dense, axillary clusters, both kinds mixed.
P. pumila Gr. Ascending, weak, succulent; lvs. on long petioles, rhombic-ovate, crenate-serrate, membranous and glabrous, 3-veined; fls. in short clusters; sepals slightly unequal. - In waste places, about buildings and in woods, U. S. and Can. St. fleshy, semi-transparent when growing in shades, smooth and shining, 3 to 18' long, simple or branched. Lvs. pale green, 1 to 2' by 8 to 16", petioles of about the same length. Sep. much shorter than the greenish, mottled achenium, one of them a little longer than the other two. Jl. - Sept. (Urtica, L. Adice, Raf.)
4. BŒHME'RIA, Jacq. False Nettle. (Named for G. F. Bœhmer, a German botanist.) Flowers 8 or _ . Calyx 4-parted, with lan-
ceolate, acute segments; stamens 4; calyx tubular, truncate or 4-toothed, persistent and closely investing the ovate, pointed achenium. - Herbs or shrubs, stingless. Lvs. opposite or alternate. Fls. clustered.
1 B. cylindrica Willd. Herbaceous, dioecious, smoothish; lvs. opposite, ovate, acuminate, dentate, on long petioles; sterile spikes interrupted, fertile cylindric. - A coarse, nettle-like plant, in swamps and bottoms, Mid. and W. States. St slender, obtusely 4-angled, channeled on each side, 2 to 3f high. Lvs. 3-veined, 3 to 5' long, half as wide, petioles 2 to 3', the upper sometimes not quite opposite. Fls. minute, the fertile spikes 1 to 2' in length, the barren spikes longer and more slender. Jl., Aug. (Urtica capitata L ?)
2 B. lateriflora Muhl. Whole plant rough-pubescent, monoecious; lvs. all alternate, ovate-lanceolate, long-acuminate, dentate, rounded and subpeltate at base, on short petioles; upper spikes long and sterile, 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, thick, on petioles 4 to 7" long. Fertile spikes as long as the petioles, 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 monoecio-polyga-mous, in clusters, surrounded by a many-bracted involucre. Calyx 4-sepaled; stamens 4, at first incurved, elastically expanding. Calyx tubular-campamilate, 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. Pennsylvanica Muhl. Lvs. oblong-lanceolate, veiny, tapering to an obtuse point, entire, punctate with opaque dots; invol. longer than the flowers. - 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 1/2' wide and 3 or 4 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, June.
2 P. Floridana Nutt. Lvs. roundish-ovate, obtuse, as long as the petiole, opaquely punctate; fls. as long as the involucre. - Damp, sandy soils, Ga. and Fla. St. decumbent at base, branches erect, 10 to 12' high. Lvs. small, 1' long, including the filiform petiole, 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-sepalcd; stamens 5; anthers with 2 pores at the summit. Bracts imbricate, large, entire, concave, persistent, 1-flowered, forming an oblong anient; calyx of 1 sepal; membranous, entire, persistent; styles 2; achenium invested by the thin calyx; embryo coiled. - Twining with the sun. Lvs. opposite. Fls. in axillary panicles and strobile-like aments.
H. lupulus L. The hop-vino is found wild in hedges, etc., throughout this country, and is, as every one knows, extensively cultivated for the sake of its ament-like 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 innumerable, panicled, greenish; those of the fertile, in aments with largo scales. Cal. and scales in fruit covered with reddish, resinous atoms (lupulin) in which the virtue resides. Jl.
7. CAN'NABIS, Tourn. Hemp. Flowers . - 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. Lvs. opposite, digitate. Fls. axillary, in cymous panicles, in sessile spikes.
C. sativa L. Lvs. palmately 5 to 7-foliatc. - The hemp springs up spontaneously in our hedges and waste grounds. It is a tall, erect plant, with handsome petiolate leaves. Lfts. lanceolate, serrate, 3 to 5' long, 1/5 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., etc, as one of the staples. Jn. § India.