Published March 1993. A more recent revision exists. Please look for up-to-date information in the OSU Extension Catalog: https://catalog.extension.oregonstate.edu
Creeping buttercup (Ranunculus repens L.) is probably the most troublesome of several members of the buttercup family that are weeds in the Pacific Northwest (figure 1).
There are many native species of buttercup in the Pacific Northwest, but the weedy species are of European origin (figure 2). It's likely that...