4608 Mey5 Meyers Konversations-Lexikon 5. Auflage 1893–1901 Bibliogr. Institut. in Laipzig Euphorbiaceen.jpg
Taxonomy database of the U.S. National Center for Biotechnology Information
Global Biodiversity Information Facility
World Checklist of Selected Plant Families
Open Tree of Life reference taxonomy version 3.2