University/Academic
Common St. Johnswort - Invasive Plant Species of Alaska (PDF | 72 KB)
University of Alaska - Anchorage. Alaska Natural Heritage Program.
Identification/Description; Photographs; Impacts; Life Cycle; Distribution; Dispersion; Controls
Common
St. Johnsort - Invasive Plant Atlas of the United States
University of Georgia. Center for Invasive
Species and Ecosystem Health.
Taxonomy; Identification/Description;
Photographs; Introduction History; Distribution
Common St. Johnswort, Klamath Weed - Indiana Plants Poisonous to Livestock and Pets
Purdue University. Cooperative Extension Service.
Identification/Description; Photographs; Illustrations; Impacts; Habitat; Controls
Ecology
and Management of Common St. Johnswort (Hypericum
perforatum L.) (Jul 2007; PDF | 198 KB)
Montana State University. Extension.
Identification/Description; Introduction History; Impacts; Habitat; Distribution; Controls
St. Johnswort (Jul 2002; PDF | 453 KB)
Montana State University. Extension Service.
Identification/Description; Illustrations; Introduction History; Impacts; Habitat; Distribution; Controls
St. Johnswort: Identification, Management and Control
University of Nebraska - Lincoln. Cooperative Extension.
Identification/Description; Photographs; Impacts; Controls
Klamath Weed Wanted Poster--Dead, Not Alive! (PDF | 37 KB)
University of Nevada - Reno. Cooperative Extension.
Identification/Description; Photographs
Managing Common St. Johnswort (PDF | 332 KB)
University of Nevada - Reno. Cooperative Extension.
Identification/Description; Photographs; Impacts; Habitat; Controls
Common St. Johnswort - Ohio Perennial & Biennial Weed Guide
Ohio State University. Ohio Agricultural Research and Development Center.
Identification/Description; Photographs; Habitat; Distribution |