Syzygium leptostemon (Korth.) Merr. & Perry, Mem. Amer. Ac. 18 (1939)

Synonyms
Eugenia leptostemon (Korth.) Miq.
Eugenia rotata King ex Craib
Eugenia sandakanensis Merr.
Eugenia subracemosa Merr.
Eugenia urceolata King
Jambosa leptostemon Korth.
Jambosa urceolata Korth. ex Miq.
Strongylocalyx leptostachyus (Korth.) Miq.
Strongylocalyx leptostemon (Korth.) Blume
Syzygium sandakanense (Merr.) Merr. & Perry
Syzygium subracemosum (Merr.) Masamune
Syzygium urceolatum (Korth. ex Miq.) Merr. & L.M.Perry

Diagnostics
Sub-canopy tree up to 26 m tall and 42(-80) cm dbh. Stipules absent. Leaves opposite, simple, penni-veined, venation conspicuous, glabrous. Flowers ca. 8 mm diameter, white-yellowish, with protruding stamens, flowers in panicles. Fruits ca. 10 mm diameter, green-reddish, fleshy berries.

Description
Canopy tree to 20(-26) m tall, 80 cm diameter, hardly buttressed, with smooth warm grey bark; inner bark pink-brown. Parts hairless. Twig 2-3 mm diameter, elliptic or slightly angled near apex, pale orange-brown, smooth. Leaf blade c.13 x 5(11-24 x 4.5-13) cm, variable, elliptic- obovate, thinly coriaceous, drying shagreened dark tawny densely minutely pitted above, dull warm to yellow-brown obscurely to minutely black dotted beneath; base wedge shaped tapering into 5-12 mm generally short petiole; apex to 15 mm caudate; veins unequal, equally raised but not prominent on both surfaces and often in shallow folds of blade above, main veins 8(-14) pairs, tertiaries evident but hardly raised; intramarginal veins 2, well within margin, looped. Racemes ramiflorous behind leaves, to 6 cm long but often short, slender, to 2-branched. Flower bud to 7 x 4 mm, club-shaped with short slender pseudostalk and 4 prominent to 3 x 2 mm broadly ovate acute loosely erect sepal lobes with translucent margins; stamens many, yellow, extruding c.5 mm, style extruding 10 mm. Fruit c.15 mm long, ovoid-spherical, ripening wine-red and juicy, ridged or corrugated on drying, with persistent prominent sepals round calyx rim. [from Tree Flora of Sabah and Sarawak]

Ecology
Edaphically eclectic and locally common, on both sandy and clay-rich but always yellow soils and in moist places. In floodplains and on shallow peat as far into swamp forest as alan (phasic community); on and near river banks, and up to 1700 m in upper dipterocarp forest.

Distribution
Indo-China, Burma, Thailand, Peninsular Malaysia, Sumatra, Java, Borneo.

Local names
Borneo: Obah, Obar-obar, Ubah.