Single Record
Participant Info
- Species
- Polygonum argyrocoleon
- Family
- Polygonaceae
- CommonName
- silversheath knotweed
- Presence
- YES
- Status
- exotic
- EarliestDate
- 1930
- LatestDate
- 2020
- Ecosystem
- basin, shrubland, montane
- Geobotanical
- SSawatch, Garitas, SSanjuans, NCristos, UBasin
- Counties
- Alamosa, Conejos, Saguache
- Passes
- WildlifePreserves
- Baca
- Other Localities
- Comments
- For silversheath knotweed, there are only three Watershed locations: a seepage area associated with greasewood in Alamosa Co (1930); in the Baca National Wildlife Refuge by an artesian well in Saguache Co (2006); and beside a Forest Service road SW of Los Mogotes in Conejos Co (2022). This last is a photorecord that would add Conejos to counties indicated in Ackerfield (2022) and BONAP (2022). There is a collection from Taos Co, New Mexico, and more in the Rio Grande drainage from west Texas and the Big Bend country. Polygonum argyrocoleon is an Asian knotweed, introduced into the USA Southwest during the last decade of the 19th century, now concentrated in southern California, southwest Nevada, and southwest Arizona. More observations may be expected from the Watershed as average temperatures rise.
- Annotation