. Botany, an elementary text for schools. Botany. 306 THE KINDS OF PLANTS spikes (in the Knotweeds in the leaf-axils): calyx iisually 5-parted: stamens 4-9: stigmas 2 or 3: black akene lenticular or triangular. a. Knof weeds: flowers sessile in the axils of the leaves, greenish and very small. P. aviculare, Linn. Common knotweed. Doorweed. Fig. 193. Pros- trate or creeping, bluish green wiry plant, growing along the hard edges of walks and in yards, and commonly mistaken for sod: leaves small, mostly oblong, entire: sepals very small, green with a broad white margin: sta- mens 5 or more: stigm
. Botany, an elementary text for schools. Botany. 306 THE KINDS OF PLANTS spikes (in the Knotweeds in the leaf-axils): calyx iisually 5-parted: stamens 4-9: stigmas 2 or 3: black akene lenticular or triangular. a. Knof weeds: flowers sessile in the axils of the leaves, greenish and very small. P. aviculare, Linn. Common knotweed. Doorweed. Fig. 193. Pros- trate or creeping, bluish green wiry plant, growing along the hard edges of walks and in yards, and commonly mistaken for sod: leaves small, mostly oblong, entire: sepals very small, green with a broad white margin: sta- mens 5 or more: stigmas iisually 3. Annual. P. er6ctuin, Linn. Taller knotweed. One ft. or more high: leaves three or four times larger, oblong or oval and obtuse. Common annual. aa. Smartweeds; flowers in terminal spikes, mostly pinkish. b. Sheaths of leaves (surrounding stem) hairy on the edge, or the margin with a spreading border. P. orientale, Linn. Prince's feather. Several feet tall, soft-hairy: flowers in long cylindrical nodding spikes: leaves ovate: stamens 7. India; cultivated. Annual. P. Persicaria, Linn. Smartweed. Lady's thumb (from the dark blotch near the center of the leaf). Fig. 455. About 1 ft.: leaves lanceolate: spikes oblong, dense and erect: stamens usually G: stigmas 2. Weed from Europe. P. Hydropiper, Linn. Smartweed. Herbage very pungent or "smarty:" leaves oblong-lanceolate : spikes short and nod- ding, the flowers greenish : stamens G: stigmas 3. Low .,- grounds. Annual. P 1 nuiu ^- hydropiperoides, Michx. Smartweed. Herbage not Persicaria. pungent: spikes slender and erect, the flowers whitish: sta- mens 8: stigmas 3. In very wet places. Perennial. P. acre, HBK. Smartweed. Herbage pungent: leaves linear or lanceo- late, long-pointed: spikes slender and erect: flowers white or blush: sta- mens 8: stigmas 3. Low grounds. Perennial. bb. Sheaths of leaves not hairy, nor the margin bordered. P. Pennsylvdnicum, Linn. Smartweed. Pungent: plant with conspicuous glandu
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