Botanical name: Stephania erecta
Common name: Stephania
Family: Menispermaceae
Origin: Thailand
Very unusual caudex plant, with a stem swollen like a round ball. Sprouts in spring in a nice fine vine with round leaves and yellowish flowers. Prefers moderate water and filtered light. Can be grown as a unique bonsai plant on your desktop or window sill. Foliage dies back in winter, when the watering should be reduced or stopped.
Similar plants: Stephania erecta (Stephania)
Link to this plant:
https://toptropicals.com/catalog/uid/stephania_erecta.htm