The Confederated Tribes of the Umatilla Indian Reservation (CTUIR) Department of Natural Resources released the Invasive Plant Field Guide.


An invasive weed is an introduced species that causes harm to the environment, agriculture, and human health. Invasive weeds displace wildlife and native plants, lower biodiversity, decrease forage and crop production, cause injury to humans and animals, alter soil nutrients and water cycling, increase fire danger, and decrease aesthetic value. Invasive weeds threaten the “First Foods”, that are essential to maintain and enhance the Tribes traditions and culture. This guide is intended to educate CTUIR staff, community members and other stakeholders to identify invasive weeds on the Umatilla Indian Reservation (UIR). A brief description, color photographs, and recommendation for control are provided for each invasive weed listed in guide. The glossary defines technical terms that are used to describe and identify plants.

Invasive weeds listed in this guide are presently found on the reservation as well as some potential new invaders. This guide will assist with early detection of new infestations, understanding the harmful characteristics and management of invasive weeds. With everyone working together, we can successfully reduce the threat of invasive weeds.

For questions regarding invasive weeds on the UIR, contact:

The Department of Natural Resources
Range, Agriculture and Forestry Program


Tribal Service

Range, Agriculture and Forestry