Representing the collections of the Oregon State University Herbarium, the Vascular Plants database "provides access to all known vascular plant holotypes (ferns, gymnosperms, and angiosperms) and isotypes..." all within three herbaria housed at Oregon State University, University of Oregon, and Willamette University. Although the Herbarium collections have a "strong emphasis on the state of...

Created by botanist Dr. Gerald D. Carr of the University of Hawaii, this website is filled with great annotated photos of vascular plants. The site is organized into sections for the non-flowering and flowering plant families. The plant families are organized according to several systems including traditional presentation, Arthur Cronquist’s classification scheme (1981), and the phylogenetic...