St. Johnswort, Hypericum perforatum L.
By: J.P. Fitzsimmons and L.C. Burrill.
Contributors: Burrill, L. C.; Washington State University. Cooperative Extension.; Oregon State University. Extension Service.; University of Idaho. Cooperative Extension System.; United States. Dept. of Agriculture.
Series: PNW -- 442.; Weeds; PNW (Series) -- 442.; Weeds (Pacific Northwest Cooperative Extension)
Publisher: Oregon State University Extension Service; Washington State University Cooperative Extension; University of Idaho Cooperative Extension System; U.S. Dept. of Agriculture
Published: 1993
Place of publication: [Corvallis, Or.]; [Olympia, Wash.]; [Moscow, Idaho]; [Washington, D.C.]
Language: eng
Subjects: Hypericum perforatum -- Control.
Other titles: Hypericum perforatum L.
Notes: Title from caption.

"March 1993."

"A Pacific Northwest extension publication."

Also available on the World Wide Web.