Participant Info

Species

Centaurea stoebe subsp. micranthos

Family

Asteraceae

CommonName

spotted knapweed

Presence

YES

Status

exotic, noxious

EarliestDate

1993

LatestDate

2022

Ecosystem

shrubland, ruderal, urban

Geobotanical

SSanjuans, Culebras

Counties

Costilla, Rio Grande, Saguache

Passes

WildlifePreserves

Other Localities

PhotoRecords

YES Rich Haswell: Saguache Co, cattle-grazed meadow by Baughman Creek 10.27 air miles NE of South Fork, 25 Sept 2019; Rio Grande Co, Middle San Francisco Creek, 24 Sept 2022

Comments

For spotted knapweed there are four Watershed records: the earliest, near Ft. Garland in Costilla Co (1993); the second, a photorecord inside the town limits of South Fork (2016; iNaturalist #3973557); the third, a photorecord, NE of South Fork in Saguache Co (2019); the fourth by Middle San Francisco Creek in Rio Grande Co south of Del Norte (2022)—all fairly recent and found in lower montane open areas. The third location is a meadow heavily grazed by cattle, and the fourth by an ATV road. They would add Saguache and Rio Grande to counties indicated in Ackerfield (2022). Centaurea stoebe is on Colorado's B list of "noxious weeds." This exotic has spread to all USA states except for Texas, and is present in the Rio Grande drainage in New Mexico down to the border with Mexico.

Annotation