Aquatic Plants - invasive

Yellow-Flag Iris (Iris pseudacorus) on Jun 2, 2008

Submitter does not have a specimen

Description of specimen

This morning along the Max track, most of the waterways we passed have blooming Yellow flag Iris, I assume it's Iris pseudacorus. The route began at Quatama station and the sightings were before and after Beaverton Central in route to downtown PDX.


I can pin point specific sites later this week if that would be useful. Are there any other yellow flowering iris that are not invasives?

I am on the Portland Water Bureau Invasives team in concert with the Nature Conservancy. I am submitting formal invasives surveys with GPS data to TNC to map, but when I have non GPS location data is that useful to your process? Or, would you prefer another method of documentation?

Celia Cornett
GIS Specialist
Resource Protection and Planning
Portland Water Bureau

June 2, 2008, 12:26 p.m.

Thanks for submitting your report, Celia. While there are other yellow ornamental iris species, none have become widespread in wetland habitats like Iris pseudacorus has. It's good to check the WeedMapper site ( prior to submitting a report, just to see what the known general distribution and abundance are (widespread, limited distribution or unknown). If you've found something that is unknown in that area or of a limited distribution, it would be great to report it.

Photos and specific locations (lat/long) are always good to have.

I'll forward your submission to Beth Myers-Shenai who manages the WeedMapper site.

Thanks again,
Vanessa Howard
Portland State University - Center for Lakes & Reservoirs

Vanessa Howard Morgan
June 2, 2008, 1:58 p.m.