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Sesbania grandiflora
I've seen plates of these flowers for sale in the market and believe they are edible.
Tree is approx 4mtr tall and growing in a Thai friends garden
Wiki - The flowers of S. grandiflora are eaten as a vegetable in Southeast Asia, like Laos, Thailand, Java in Indonesia, Vietnam, and the Ilocos Region of the Philippines. In the Thai language the flowers are called ดอกแค (dok khae) and are used in the Thai cuisine both cooked in curries, such as kaeng som and kaeng khae,[8] as well as raw with nam phrik.[9] The young pods are also eaten, along with the leaves. In Sri Lanka, agati leaves, known as Katura murunga in Sinhala language, are sometimes added to sudhu hodhi or white curry, a widely eaten, thin coconut gravy and is believed locally to be a cure for canker sores. In India this plant is known as agati (Hindi), agastya (Kannada), agise (Telugu), and both the leaves and the flowers have culinary uses.
very popular on Java and we used too serve it as one of vegetable menu, our local people call "pecel"