Botanical name: Stigmaphyllon sp.
Common names: Orchid Vine, Butterfly Vine, Golden Vine
Family: Malpighiaceae
Origin: tropical America
It has slender, twining stems set every few inches with flat, heart-shaped leaves up to 4in long. The flowers are reminiscent of those of the Lagerstroemia in form, each petal expanding abruptly from a narrow basal claw. They measure a little over 1in across and are brilliant yellow in color. It thrives in sun or light shade and well drained soil, with moderate watering.
Similar plants: Stigmaphyllon sp. (Orchid Vine)
Link to this plant:
https://toptropicals.com/catalog/uid/stigmaphyllon_sp.htm