Syzygium rostratum (Blume) A.DC., Prodr. 3 (1828)

Synonyms
Calyptranthus rostrata Blume
Eugenia rostrata (Blume) Burgess
Eugenia tenuicuspis (Miq.) Koord. & Valet.
Jambosa tenuicuspis Miq.

Diagnostics
Understorey tree up to 16 m tall and 24 cm dbh. Stipules absent. Leaves opposite, simple, penni-veined, secondary veins placed close together, venation inconspicuous, glabrous, leaf tip elongated. Flowers ca. 9 mm diameter, white-yellowish, with protruding stamens, flowers placed in panicles. Fruits ca. 12 mm diameter, green-whitish, fleshy berries.

Description
Small to medium sized canopy or subcanopy tree to 15 m tall, with smooth grey-brown bark; inner bark thin, brown. Parts hairless. Twig slender, round, smooth, grey-brown. Leaf blade c.6 x 2.5(4-8 x 1-3) cm, small, elliptic or lanceolate, drying glistening, dark tawny above paler beneath; base wedge shaped tapering into a slender c.7 mm long stalk, acumen caudate gemerally >1/3 length of blade; densely minutely pitted above densely more or less faintly brown dotted beneath; veins c.25 pairs, subequal, equally visible distinctly raised but slender on both surfaces as also tertiaries, spreading, tertiaries typically densely finely reticulate; intramarginal vein 1, close to margin, hardly looped. Panicle to 3 terminal or 1-axillary, to 6 cm long, 2-branched, lax, slender, with minute collar-like bracts, many-flowered. Flower bud to 8 x 3 mm including 5 mm slender hardly tapering pseudostalk, club-shaped, sepal lobes 4 broadly semicircular but appearing vestigial in young buds, obtuse or subacute, thick; stamens many. Fruit to 12 x 8 mm, spherical to obovoid, at first with flared calyx lobes but caducous, with small, obscure calyx rim in ripe fruit, drying pale. [from Tree Flora of Sabah and Sarawak]

Ecology
In undisturbed mixed dipterocarp, sub-montane and montane forests up to 2700 m altitude. Usually on hillsides and ridges, but also on alluvial sites. On sandy to clay soils, sometimes on ultramafic.

Distribution
Sumatra, Java, Borneo.

Local names
Borneo: Obah, Ubah.