Weed Spotter

This page is devoted to alerting our members to new sightings of uncommon weeds.  Since 2004, CWMA has worked to provide a way for our members to receive up-to-date information about new infestations of high priority and unknown noxious weeds.  

Weed Spotter form

What's New?

July 2008

Yellow Starthistle (Centaurea solstitialis)

A new site was reported to the CDA-EDRR Specialist just outside of Beulah (Southwest of Pueblo) in  Pueblo County on private land. The estimated acreage is 40 acres with approximately 20% infested with Yellow starthistle.

photos by CDA-EDRR

African Rue 

Reported to the CDA-EDRR Specialist by Nan Lederer of the CU Herbarium.  This infestation is located northeast of Trinidad in Las Animas County on the County Road 95 right-of-way. Plants extended along the road for approximately 200 yards.

photos by Jim Walker

Swainsonpea (Sphaerophysa salsula) 

Mark Sweppenheiser of Jefferson County Weed and Pest discovered Swainsonpea near Morrison.

For more info

photos by Alicia Doran

January 2008

Yellow Flag Iris (Iris pseudacorus)

Ray Sperger, owner of Ark Ecological Services, LLC has reported Yellow flag iris.  It was spotted along the edge of a pond in Loveland.  Other sightings include Boulder County.

This non-native plant is listed as a noxious weed in a number of other states.  It can quickly form a monoculture along the edge of wetlands..

INFO - http://dnr.metrokc.gov/wlr/lands/weeds/iris.htm

top photo: Ray Sperger

lower photo: King County WA Noxious Weed Control Program

October 2007

Narrow-leaved Dalmatian toadflax (Linaria genistifolia)

Garfield County

Paul Burgell of Rio Blanco County reported 5 acres of narrow-leaved Dalmatian toadflax found on private property in Loma which is just over the county line in Garfield County.  

INFO - www.ext.colostate.edu/PUBS/NATRES/03114.pdf   

http://tncweeds.ucdavis.edu/esadocs/linadalm.html

Image - www.s-weeds.net/familjer/tubiflorae/scrophulariaceae/linariagen.html

 SEPTEMBER 2007

Common tansy (Tanacetum vulgare)

Douglas County

Denny Bohon, USFS, spotted common tansy growing on private property west of West Creek along CR 68.

INFO - usda plants database 

photo: www.mda.state.mn.us/.../ common_tansy.htm 

Weed Spotter Archive 

Copyright © 2006-2008, Colorado Weed Management Association. 
This internet site may contain links to external Internet sites. CWMA does not in any manner express or implied, approve or promote, make any representation, or endorse any opinions expressed on any of these outside Web sites.

contact webmaster