Botanical name: Adenia glauca
Common name: Adenia
Family: Passifloraceae
Origin: Southern Africa, Botswana
USDA Plant Hardiness Zone Map
This is a mature plant, it has a very thick, green caudex. The flowers are lemon colored, and are sweetly scented.
Similar plants: Adenia glauca (Adenia)
Link to this plant:
https://toptropicals.com/catalog/uid/adenia_glauca.htm