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Photographer: Janice Stiefel
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Family Polygonaceae
Polygonum aviculare L. subsp. depressum (Meisn.) Arcang.
door-yard knotweed, oval-leaved knotweed
Polygonum: derived from the Greek words polys, "many," and gonu, "knee or joint," hence "many joints" because of the thickened joints on the stem
aviculare: relating to small birds
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| Status: | Introduced - naturalized |
| Plant: | matting, annual forb; stems with many branches, nodes 2-parted and becoming jagged |
| Flower: | white to pink-edged, 5-parted, petals and petal-like sepals joined at base, with flat or rounded tips, outer 3 not longer than the other 2; inflorescence small clusters from the leaf axils |
| Fruit: | dark brown, dull, dry seed |
| Leaf: | alternate, bluish-green, all alike, mostly 2-5 times as long as wide, bases jointed |
| Habitat: | disturbed sites, sidewalks, streets |
| (Glossary) |
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 Arcang.&phog=Robert R. Kowal&spcode=POLAVIsDEP)
 Arcang.&phog=Janice Stiefel&spcode=POLAVIsDEP)
