Amomum littorale J. König in Retzius, Observ. Bot. 3: 52. 1783; Achasma megalocheilos Griffith; Amomum megalocheilos (Griffith) Baker; Hornstedtia megalocheilos (Griffith) Ridley.

Pseudostems 2--3 m. Ligule oblong, 6--13 mm, apex acuminate; petiole 0.5--3 cm; leaf blade abaxially light brown when dry, oblong to oblong-lanceolate, 50--70 × 9--15 cm, glabrous except hairy along midvein and at margin abaxially, base subrounded or attenuate, oblique, apex shortly acuminate. Inflorescence a head, ca. 10 cm in diam. at anthesis; peduncle embedded in ground, short, 1--3 cm; bracts ovate or oblong, 3--5 × 1.5--2 cm; bracteoles tubular, ca. 4.5 cm. Flowers 4--12 opening together, red. Calyx 6.5--7 cm, split to middle on 1 side, apex 3-toothed. Corolla tube 3--5 cm; lobes oblong, 2.2--2.6 cm × 5--7 mm. Labellum bright red at margin, obovate-oblong, free part 4.5--5.5 × 1.5--2 cm, base expanded, middle slightly narrowed, margin incurved, apex entire or emarginate. Filament ca. 1 cm; anther ca. 1 cm, apex emarginate. Ovary densely pilose. Style 5--6.5 cm; stigma rhombic, ciliate. Capsule globose, ca. 3 cm in diam., pubescent. Fl. Apr--May. 2 n = 48*.

Forest floors; 200--300 m. Hainan [Indonesia (Borneo, Java, Sumatra), Malaysia, Thailand].