Vascular Plants Families and Genera, Kew
Vascular Plants Family Acces Page
Systematic Plant Taxonomy System - Hope Dalton
The Web Lift to Taxa - U.C. Berkeley, Museum of Paleontology
Plant Biology at Ohio State University Lima
Tavole di Botanica Systematica
Comparative Plant Biology: Image Gallery
The Families of Flowering Plants
Angiosperm Phylogeny Group classification
Present State of Angiosperm Phylogeny (1997)
Ericaceae - The Heather Family
Palmae - Virtual Palm Encyclopedia
Palmae - The European Palm Society
History and classification of ferns - The Dutch Fern Society