Online databases with Peperomia species

International botanical collections - Swedish Museum of Natural History (S)
Type Specimen Register - Smithsonian National Museum of National History (US)
Catalog of Vascular Plants - Muséum National d'Histoire Naturelle (P)
Digital Specimen Server - Botanic Garden and Botanical Museum Berlin-Dahlem (B)
Taxonomic Name and Specimen Search - Bishop Museum
IPNI - International Plant Name Index
Plants Database - USDA (United States Department of Agriculture) - NRCS (National Recources Conservation Service)
Type Specimens - Dutch Herbaria (Leiden - Utrecht - Wageningen) (NHN)
Index of Botanical Specimens - Harvard University Herbaria (GH)
Type Specimens - University of Zurich Herbarium (Z & ZT)
Vascular Plant Type Catalogue - Kew Herbarium Catalogue (K)
Vascular Plant Type Catalogue - New York Botanical Garden (NY)
w³ TROPICOS - Vascular Tropicos Nomenclatural Database (Missouri Botanical Garden) (MO)

Nomenclature

ICN - International Code of Nomenclature (Melbourne Code)

General

Garden Web Glossary - Glossary of botanical terms
Index of Botanists - Harvard University
Index Herbariorum - The herbaria of the world
IPNI databases on authors and publications