Allantoma decandra (Ducke) S. A. Mori, Y.-Y. Huang & Prance

Tree to 40.0 m tall. Stems: young branches glabrous, lenticellate. Leaves: petiole 10.0-25.0 mm long x 1-4 mm broad, glabrous, slightly winged towards lamina, lower portion not winged, plane or slightly canaliculate above; blades ovate to oblong-ovate, 6.0-12.0(-19) x 3.0-7.0(-8.5), glabrous abaxially, the base subcuneate, slightly decurrent onto petiole, the margins entire, often slightly undulate, the apex acuminate, the acumen 5.0-15.0 mm long; midrib prominent on both surfaces, glabrous, the secondary veins eucamptodromous, in 9-14 pairs, prominulous to plane above, prominent beneath, 3.0-11.0 mm apart at base, without domatia at junction with midrib. Inflorescences terminal and subterminal panicles to 12.0 cm long, the rachis and branches glabrous, not crustaceous. Flowers when leaves present, sessile; calyx ca. 2.0 mm long, campanulate, the lobes 5, oblong, acute, glabrous; petals 5, oblong, 4.0-5.0 mm long; staminal tube ca 1.5 mm in diameter at base, divided into ca. 11 inwardly reflexed stamens, the stamens arising from the top of the tube; ovary 3-locular, the ovules numerous per locule, the style very short. Fruits 11.0-13.0 x 3.0-3.5 cm at broadest point, distinctly costate longitudinally, broadest at calycine ring, the calycine ring very distinct, 7.0-15.0 mm below apex, the pericarp thin at apex (ca 1.5 mm thick), without teeth at line of opercular dehiscence; operculum triangular at apex, to ca 2.5 cm x 10.0 cm long, the columella triangular. Seeds rounded-triangular, to 2.5 cm long, the seed wings reaching 5.0-7.0 x 2.0 cm.