Summary ¹

Polygonum caespitosum or Tufted Knotweed is a summer annual weed plant of the family Polygonaceae, native to eastern Asia, from China to Japan and Southeast Asia. The plant grows to 3.5 feet in height with elliptic to lanceolate leaves, usually 20-75 mm long. It has small pink or red flowers arranged in tight terminal spikes.

Sources and Credits

1. (c) Wikipedia, some rights reserved (CC BY-SA), http://en.wikipedia.org/wiki/Polygonum_caespitosum

More Info

• iNat taxon page
• Biodiversity Heritage Library
• BOLD Systems BIN search
• eFloras.org
• Global Biodiversity Information Facility (GBIF)
• HOSTS - a Database of the World's Lepidopteran Hostplants
• IPNI (with links to POWO, WFO, and BHL)
• SEINet Symbiota portals
• Tropicos
• World Flora Online

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