Cascabela thevetioides (Giant Thevetia)
Botanical names: Cascabela thevetioides, Thevetia thevetioides
Common names: Giant Thevetia, Large-flowered Yellow oleander
Family: Apocynaceae
Origin: Mexico
USDA Plant Hardiness Zone Map
Thevetia thevetioides (Giant Thevetia) - A small, open, evergreen tropical tree or a large shrub where it reaches to 15 feet tall and is sparsely foliaged with attractive dark green leaves at the branch tips. From mid-summer to late fall this plant produces showy 4 inch wide bright yellow funnel-shaped flowers.
Similar plants: Cascabela thevetioides (Giant Thevetia)
Link to this plant:
https://toptropicals.com/catalog/uid/cascabela_thevetioides.htm