Adenia keramanthus (Adenia)
Botanical name: Adenia keramanthus
Common name: Adenia
Family: Passifloraceae
Origin: South Africa
The flowers are green, and beside seeds, it might be possible be cuttings as well.
Similar plants: Adenia keramanthus (Adenia)
Link to this plant:
https://toptropicals.com/catalog/uid/adenia_keramanthus.htm