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| | Polygonum genus part 2 (Site not responding. Last check: 2007-10-19) |
 | | kelp, longroot smartweed, marsh smartweed, swamp knotweed or persicaria, devils shoestring, tanweed, amphibious bistort, Polygonum coccineum Muhlenb., Polygonum coccineum Muhl. |
 | | common knotweed, willow-weed, willow smartweed, pale persicaria, wireweed, nodding smartweed, dockleaf smartweed |
 | | Colonizing perennial with creeping rhizomes and erect to spreading stems to 1.5 m tall. |
| www.cdfa.ca.gov /phpps/ipc/weedinfo/polygonum-smartweeds.htm (1250 words) |
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