| Common Names - Knotweed | Synonyms - |
| Authority - L. | Gymnosperm or Angiosperm? Angiosperm |
| Plant forms - Mostly herbs, bad weeds | Total Number of species - 40 |
| World Distribution - Northern temperate zones, S. South America | |
| Comments - Has wood | |
| 1 - Polygonum paronychia. |