Participant Info

Species

Tripleurospermum inodorum [Matricaria inodora] [Chamomilla inodora] [Matricaria maritima subsp. inodora] [Tripleurospermum maritimum] etc.

Family

Asteraceae

CommonName

scentless mayweed, wild chamomile

Presence

YES

Status

exotic, noxious

EarliestDate

1918

LatestDate

2015

Ecosystem

foothill, montane, ruderal

Geobotanical

Garitas, SSanjuans

Counties

Conejos, Mineral, Rio Grande

Passes

WildlifePreserves

Other Localities

PhotoRecords

YES Rich Haswell: Mineral Co, Above Creede by Willow Cr. 4 July 2014; Mary E. McDonald: Conejos Co, near Elk Creek cpgd 29 Sept 2015

Comments

Historically, the earliest Watershed record of Tripleurospermum inodorum comes from Del Norte, dated 1918. Then four records follow, 2003-2015, from around the Conejos River and by Willow Creek above Creede. The Willow Creek photorecord (2014) would add Mineral to counties indicated in Ackerfield (2022) and BONAP (2022). It remains to be seen if these populations persist. This exotic from Eurasia is on Colorado's B list of "noxious weeds," as well as Washington State's—but not so in any other USA state. There are scattered locations across the northern half of the USA. The species is recorded from Taos Co, New Mexico, but no farther down the Rio Grande drainage. These few upper Rio Grande collections mark the farthest south in the Western USA distribution.

Annotation