Thespesia populnea

Small tree in the mallow family which is resistant to drought, wind and seaside conditions. Thespesia is native to coastal S Asia and it was spread to the Pacific Islands by austronesian travellers, about 5000 years ago, because of its usefulness, related to wood and medicines. It makes a perfect shade tree, windbreak or hedge. It also bears abundant hibiscus-like yellow flowers.

Pictures from wikimedia commons:
Picture of the flower: Filo gèn', CC BY-SA 4.0 <https://creativecommons.org/licenses/by-sa/4.0>, via Wikimedia Commons
Picture of the leave: Forest & Kim Starr, CC BY 3.0 <https://creativecommons.org/licenses/by/3.0>, via Wikimedia Commons