Omphalea sargentii Merr., Philipp. J. Sci. 16: 574 (1920)
Named after Charles S. Sargent [1841-1927], founder of the Arnold Arboretum (Harvard University).
Lianas up to 23 m in height, to ca. 22 cm in diameter; branches glabrous or glabrescent; tendril-like shoots with short hook-like branches;
foliage evergreen. Leaves: petioles 1—4(—8) cm long, glabrous or sometimes very sparsely pubescent; blades ovate, elliptic or rarely obovate,
13—29 by 5—14 cm, length/width ratio 1.5—3, somewhat leathery, glabrous, usually drying brownish, base obtuse, rounded, or rarely acute,
with two round glands adaxially, apex acuminate; venation pinnate with basal lateral pair of nerves often prominent and diverging at a
steep angle, nerves 6-11 per side; understory and juvenile leaves with petioles to 21 cm and blades to 40 by 23 cm. Inflorescences
paniculate thyrses, 20—70 cm long, highly branched; axes glabrous or very sparsely pubescent, minor axes dark reddish brown or purplish
when dry; main branches 2—20, to 50 cm long, main axis persistent, often becoming tendrillate, with strongly recurved, hook-like branch
bases; cymose units very condensed with flowers appearing fasciculate; bracts to 12 by 3 cm, petiolate, biglandular; blade obovate or
narrowly elliptic, apex obtuse or acute. Staminate flowers: pedicel 6—16 mm long; sepals 5, 1—2 mm long and wide, apex rounded or
broadly obtuse, glabrous to very sparsely pubescent; disc subannular, indistinct; androecium of 3 free, subsessile anthers fused basally.
Pistillate flowers: pedicel 4—14 mm long; sepals 5, suborbicular to broadly ovate, 1—2.5 mm long and wide, glabrous to very sparsely
pubescent; gynoecium ovoid or subglobose, 1.7—3.2 by 1.5—2.8 mm, apex obtuse or rounded, glabrous; stylar column absent or present as small
conical apex, to 0.5 by 1.2 mm. Fruits indehiscent, subglobose, 3.4—5.4 by 3.7—6 cm when dry; pericarp fleshy, 3—6 mm thick and deeply
wrinkled when dry. Seeds broadly ellipsoid, radially compressed, 2.5—3.6 by 2.3—3.3 by 1.7—2.2 cm, medium brown, dull, rough, minutely
verrucate; outer seed coat thin, whitish, papery when dry, not persistent. [from http://www.nationaalherbarium.nl/thaieuph/]
Lowland evergreen primary forest, sometimes in secondary forest, on level land, low hills or near rivers; soils: clay, poor sandy, gravel
terrace. Altitude: sea-level to 350 m.
Peninsular Thailand, Malay Peninsula, Borneo (Sabah, Kalimantan), Sulawesi, and the Philippines.