Water Primrose

Ludwigia peploides

© John M. Randall/The Nature Conservancy


Description

Water primrose is a tall, upright, creeping or floating aquatic perennial herb. The lanceolate leaves are alternate, simple, and net-veined. The yellow, five-petal flowers are axillary, perfect, and solitary. The fruit is a capsule with many seeds.

Habitat

Rivers, streams, lake and pond margins, irrigation channels and other wet habitats

Distribution

Linn County, Oregon; King County, Washington

Impacts

Chokes out native species, hinders human activities such as water travel, irrigation, etc. The dense above-water growth can also be a home for disease-bearing insects

Dispersal Methods

Water currents, birds and other wildlife

Prevention

This plant must be pulled before large colonies are established.

Factsheets

Washington State Noxious Weed Control Board Fact Sheet
Western Invasives Network Yellow Water Primrose

Photos

http://calphotos.berkeley.edu/cgi/img_query?query_src=photos_index&where-taxon=Ludwigia+peploides

Distribution Map

Oregon Distribution Map (No Distribution Map for Washington Available)

Identification Help

Great images from Alabama Plants

Other Links

Species Account from the Peconic Estuary Program
The Invasion of the Ludwigia peploides - A Research Example of Cemagref, A French Public Research Institute
Invasive Luwigia Management Plan for the Laguna de Santa Rosa, Sonoma County, California

CWMA Warnings

Upper Willamette
WEEDIN