Participant Info

Species

Erigeron canadensis [Conyza canadensis]

Family

Asteraceae

CommonName

horseweed

Presence

Yes

Status

exotic

EarliestDate

1930

LatestDate

2023

Ecosystem

basin, shrubland, foothill, montane, ruderal, urban

Geobotanical

Garitas, SSanjuans, UBasin, LBasin

Counties

Alamosa, Conejos, Costilla, Hinsdale, Mineral, Rio Grande, Saguache

Passes

WildlifePreserves

Baca, Great Sand Dunes, Russell Lakes

Other Localities

PhotoRecords

YES Rich Haswell: Saguache Co, Russell Lakes WP 22 July 2016; Rio Grande Co, abandoned gravel pit one mile NE of Del Norte 27 July 2021

Comments

Not frequently collected from the Watershed, but present in the Upper and Lower Basins and surrounding mountains, Erigeron canadensis likes disturbed ground and tolerates alkaline soil. The Del Norte photorecord observations would add Rio Grande to Watershed counties indicated in Ackerfield (2022) and BONAP (2022). This exotic has been recorded from every state, nearly every county, in the USA, and steadily follows the Rio Grande drainage through New Mexico and Texas down to the Gulf of Mexico

Annotation