Full text index of the 1998 version of the Biota of North America Program's checklist.

A growing directory of the hierarchy, from Kingdom down to species, with common names included, and descriptive pages on selected species.

Continuing project with annotated checklists of pteridophytes, gymnosperms, and most monocots, with links to dot maps for each taxon.

Southern Illinois University's guide to the taxonomic and evolutionary relations among terrestrial plants, with extensive links to other resources.

Database of the names and associated basic bibliographical details of all seed plants.

Database of references to publications on the taxonomy of flowering plants, gymnosperms, and ferns.

The herbarium and the associated paleobotanical collection have combined holdings of approximately 1/2 million specimens. Includes library search, catalog, and project information.

Large collection of photographs, arranged by family.

Taxonomically arranged images and summaries of family characteristics.

Information including keys, descriptions and illustrations of species available in Adobe pdf format by Shinners and Mahler.