Land Plants - invasive

Yellow Starthistle (Centaurea solstitialis) on May 31, 2008

Submitter does not have a specimen

Description of specimen

About knee high, all dried brown (last October). Needle like projections around where the flower had been. I've seen Yellow star thistle before and I have no doubt that is what it was, I've seen it in Idaho on the lower Main Salmon River. I used to be a river guide on the Rogue in the 70's. I float the river every other year or so. I pay attention to plants and have never seen this plant before on the Rogue. Didn't have a camera with me, but it looks just like the picture on this website.


Dear Ken,

Thank you for this important report of yellow starthiste. I will forward your report to the Oregon Department of Agriculture Noxious Plants and the local lead in weed management so we can plan a response. It is good that you controlled the patch you found immediately. Thank you! The areas should be surveyed since there is no doubt there is more in the area. Feel free to contact me with questions about the status of our response.


Tania Siemens
Oregon State University Sea Grant Extension

Tania Siemens
June 1, 2008, 5:21 a.m.