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Exostema caribaeum (Jacq.) Roem. & Scult.;

Tree; leaves opposite, simple, elliptic, base obtuse to rounded, margins entire, apex acute, with small barbs along the midrib on the under-side; flowers solitary, axillary; petals white, fused into an elongate tube, diverging into 5 recurved, linear, lobes; satamens, style and stigma well-exserted; ovary inferior; fruit a capsule.

Additional images:

Listed as an important source of pollen and/or nectar for bees (Souza Novello 1981).