VIRGINIA KNOTWEED
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| File Size: 44 KB |
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Polygonum virginianum L.
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| Konza Prairie, Riley County, Kansas |
| Perennial |
| Height: 1-5 feet |
| Family: Polygonaceae - Buckwheat Family |
| Flowering Period: July, August, September |
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| Stems: | | Erect, simple or branched above, nearly glabrous or stiff-hairy. | | Leaves: | | Alternate, short-stalked below, nearly sessile above, ovate to ovate-lanceolate, 1 to 6 inches long, to 3.5 inches wide, sparsely stiff-hairy; margins entire; tips tapering-pointed; stipules sheathing, tube-like; top margins fringed with short bristles. | | Inflorescences: | | Racemes, slender, spike-like, to 12 inches long, sparsely flowered, somewhat arching, terminal and in upper leaf axils. | | Flowers: | | 1-3 per cluster, spaced some distance apart, about 1/10 inch long; petals absent; perianth segments 4, petal-like, whitish to greenish, joined below; stamens 4; styles 2, extending beyond perianth edges. | | Fruits: | | Achenes, egg-shaped, shiny, brown. | | Habitat: | | Woods, thickets and stream banks. | | Distribution: | | East 1/2 of Kansas. | | Uses: | | Native Americans treated whooping cough with a tea made from a mixture of Virginia knotweed leaves and the bark of the honey locust tree. | | Comments: | | Virginia knotweed forms clumps via rhizomes. |
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