. Foundations of botany. Botany; Botany. DICOTYLEDONOUS PLANTS 67 reflexed at maturity. Calyx green, the valves broadly triangular, abruptly pointed, reticulated, a distinct long and narrow tubercle on the back of each. Swamps and wet ground.* 3. R. crispus, L. Yellow Dock. Stout, smooth, 3-4 ft. high. Leaves lanceolate, margins very wavy, acute, the lower more or less heart-shaped. Root long, tapering gradually downward, yellow, vei'y tough. Mowers in whorls crowded in long, straight, slender racemes. Valves roundish heart-shaped, mostly tubercled. A very hardy weed, introduced from Europe. n
. Foundations of botany. Botany; Botany. DICOTYLEDONOUS PLANTS 67 reflexed at maturity. Calyx green, the valves broadly triangular, abruptly pointed, reticulated, a distinct long and narrow tubercle on the back of each. Swamps and wet ground.* 3. R. crispus, L. Yellow Dock. Stout, smooth, 3-4 ft. high. Leaves lanceolate, margins very wavy, acute, the lower more or less heart-shaped. Root long, tapering gradually downward, yellow, vei'y tough. Mowers in whorls crowded in long, straight, slender racemes. Valves roundish heart-shaped, mostly tubercled. A very hardy weed, introduced from Europe. n. POLYGONUM,!,. Annual or perennial, terrestrial or aquatic herbs, with enlarged joints and simple, alternate, entire leaves; the sheathing stipules often cut or fringed. Mowers perfect, usually white or rose-colored, each flower or cluster subtended by a membranaceous bract, similar to the stipules of the leaves. Calyx mostly 5-parted, the divisions petal-like, erect and persistent. Stamens 3-9. Styles 2-3-parted. Pruit lens-shaped or 3-angled.* 1. P. aviculare, L. Knot-grass. Annual or perennial. Stem prostrate or ascending, diffuse, smooth, 6-24 in. long. Leaves small, lanceolate or linear-oblong, obtuse, nearly or quite sessile. Stipules thin and dry, 2-3- cleft or cut. Flower-clusters axillary, 1-5- flowered, flowers inconspicuous, nearly ses- sile. Calyx greenish-white, 5-parted, the lobes with white or colored borders. Stamens 5-8. Style 3-parted; akene 3-angled, not shining. A common weed in dooryards and A B where the ground is trampled.* Fio. lo.—Buckwheat. 2. P. Dumetorum, L. False Buck- a, flower, longitudinal sec- WHEAT. Perennial; stems slender, twining, «°°^! enifredf "*" ^""^ branched, 2-10 ft. long. Leaves ovate, ^ » en arge j. taper-pointed, heart-shaped to halberd-shaped at the bas^ long- petioled. Stipules cylindrical, truncate. Flowers in axillary, more or less compound and leafy racemes. Calyx greenish-white, the outer lobes winge
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