Barringtonia macrostachya grows as a shrub or tree up to tall, with a trunk diameter of up to . The bark is brown, greenish yellow, greyish brown or brown mottled grey. The fruits are obovoid, up to long. The specific epithet macrostachya is from the Greek meaning 'large spike', referring to the inflorescence. Its habitat is riverine and swamp forest, from sea level to altitude. Local medicinal uses include the treatment of ringworm, sore eyes and stomach aches. Barringtonia macrostachya has been used as fish poison. It is found in China, Burma, Thailand, Vietnam, Malaysia, Brunei, Indonesia and the Philippines.
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