Xylophragma seemanniana Xylophragma platyphyllum Xylophragma tenue Xylophragma corchoroides Xylophragma heterocalyx Xylophragma myrianthum Xylophragma harleyi Xylophragma unifoliolatum
Rojasiophyton Orthotheca Heterocalycium
World Flora Online, http://www.worldfloraonline.org/, accessed June 20, 2024