Participant Info

Species

Conium maculatum

Family

Apiaceae

CommonName

poison hemlock

Presence

Yes

Status

exotic, noxious

EarliestDate

1981

LatestDate

2017

Ecosystem

montane

Geobotanical

SSanjuans

Counties

Conejos

Passes

WildlifePreserves

Other Localities

PhotoRecords

YES Mary E. McDonald: Conejos Co, on the Conejos River between Mogote and Aspen Glade cpgd 23-28 July 2017

Comments

In the Watershed there is only one herbarium record of Conium maculatum and it says merely “Conejos River” (1981). With the Conejos River photorecord of 2017, these two locations would add Conejos to the counties indicated in Ackerfield (2022) and BONAP (2022). So there is only scant evidence that poison hemlock has established itself in the Watershed. The species is on Colorado's C list of "noxious weeds." The exotic has established itself in every state of the USA. There are very scattered records of it in the Rio Grande drainage down to the Big Bend country of Texas. One is a 1979 observation from the Rio Grande river in New Mexico, W of Taos along the gorge at John Dunn bridge.

Annotation