Herbarium Blackwellianum emendatum et auctum, id est, Elisabethae Blackwell collectio stirpium.Norimbergae : Typis Io. Iosephi Fleischmanni, 1750-1773..biodiversitylibrary.org/page/291049
2005 The Regents of the University of California
CalPhotos
Three miles W. of Camptonville. Bushy herb type. Species is Hypericum perforatum on abandoned cultivated ground. (Air photo 119-58). Quad name: Smartsville. Quad number: 50.