Which is a genus of vine, Epithelantha or Hardenbergia?
Epithelantha Epithelantha (button cactus) is a genus of cactus that is native to northeastern Mexico, and in an area from western Texas to Arizona. "Epithelantha" has two species, "Epithelantha micromeris" and "Epithelantha bokei". The name "Epithelantha" refers to the flower position near the apex of the tubercles.
Dioscoreophyllum volkensii Dioscoreophyllum volkensii (Serendipity berry) is a tropical dioecious rainforest vine in the family Menispermaceae. It is native throughout most of tropical Africa from Sierra Leone east to Eritrea, and south to Angola and Mozambique. It grows at low altitudes, from sea level up to 400 m. Some authors separate plants from above 200 m as a separate species "D. cumminsii" (Stapf) Diels.