Cyathocalyx martabanicus Hook. f. & Thomson in Fl. Brit. India 1: 53. 1872.

Trees, 10 - 12 (or more) m tall; young branches puberulous. Leaves elliptic, cuuneate at base, abruptly shortly acuminate at apex, 20 - 29 x 7 - 11 cm, shiny glabrous on both surfaces; lateral nerves puberulous beneath when young; petioles 10 - 14 mm long. Flowers usually solitary, sometimes 2 - 3 together, extra-axillary; pedicels pubescent, ca 8 mm long, ebracteate. Sepals connate up to middle, then divided deeply into 3 oblong-lanceolate acute reflexed lobes, ca 7 x 5 mm, pubescent. Petals clawed, thick, yellowish pubescent; outer petals oblong, concave and conniving at base, spreading above, 25 - 30 x 5 - 7 mm; inner ones shorter and narrower than outer ones. Stamens numerous, cuneate, truncate at top of connectives, ca 2 mm long; anther-thecae linear. Carpels on concave torus, solitary or paired, oblong, 3 - 4 mm long, many-ovuled; stigma sessile, peltate. Ripe carpels solitary or in pairs, ellipsoid to oblongoid, blunt at top, ca 10 cm long, 5 - 6 cm across, torulose, transversely grooved, glabrous; pericarp thick, fleshy; stalk 1 - 1.3 cm long, stout. Seeds 8 - 10, in 2 rows, ca 4 x 1.5 cm.

Fl. April - May; Fr. Oct. - Nov.

Distrib. India: Assam, Nagaland and Meghalaya.

Myanmar.