Correspondence and notes regarding taxonomic investigations of plants of the state of Washington, the collection of botanical specimens, the preparation of regional floras, the history of botanical study of the Pacific Northwest, and the identification of plants for the public. Siginificant correspondents include: R.K. Beattie, F.V. Coville, F.A. Golder, Edmond S. Meany, B.L. Robinson, W.N. Suksdorf.
Correspondence, notes, and other papers regarding taxonomic studies of Pacific Northwest plants, the teaching of botany and the administration of herbariums at Washington State University and the University of Hawaii. Significant correspondents include: R.K. Beattie, F.V. Coville, Alice Eastwood, Aven Nelson, C.V. Piper, B.L. Robinson, C.P. Smith, and W.N. Suksdorf.