Online USDA database of information, images, and links on plants in the USA, including crops and invasives. Search by name, geographic distribution, or other characteristics.
Glossary of Latin terms used in species names, from abbreviatulus to yunnanensis.
Full text index of the 1998 version of the Biota of North America Program's checklist.
Continuing project with annotated checklists of pteridophytes, gymnosperms, and most monocots, with links to dot maps for each taxon.
Distribution maps of vascular plants of Hokkaido, Japan.
Information including keys, descriptions and illustrations of species available in Adobe pdf format by Shinners and Mahler.
Images of hundreds of species of ferns, fern allies, and flowering plants, arranged by genus.
Large collection of photographs, arranged by family.
Taxonomically arranged images and summaries of family characteristics.
Searchable, illustrated collection.
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