Aldrich-Markham, Susan; Oregon State University. Extension Service; Washington State University. Cooperative Extension; University of Idaho. Cooperative Extension System; United States. Dept. of Agriculture; Pacific Northwest Cooperative Extension ([Corvallis, Or.] : Oregon State University Extension Service ; [Pullman, Wash.] : Washington State University Cooperative Extension ; [Moscow, Idaho] : University of Idaho Cooperative Extension System ; [Washington, D.C.] : U.S. Dept. of Agriculture, 1995-02)
Four speedwell species are important weeds in the Pacific Northwest:
• Ivyleaf speedwell (Veronica hederaefolia L.)
• Persian, birdseye, or winter speedwell (Veronica persica Poir.)
• Creeping speedwell (Veronica fili ...