Crassula rupestris x perforata (baby necklace)1.jpg
Plantarum historia succulentarum = (Plate 25) BHL280748.jpg
Taxonomy database of the U.S. National Center for Biotechnology Information
Global Biodiversity Information Facility
Open Tree of Life reference taxonomy version 3.2
Illustrated Handbook of Succulent Plants
A dataset on catalogue of alien plants in China
A dataset on inventory and geographical distributions of vascular plants in Beijing, China
Royal Horticultural Society Plant Database