Tree to 6–18 m tall, 20–30 cm diameter. Bark smooth or fissured, greyish brown; inner bark strongly scented with cinnamon smell. Sapwood yellowish. Twigs stout, terete, 2–3 mm diameter, apically angular, glabrous, dark brown. Terminal buds not perulate, conical, c. 2 mm, densely covered with straight appressed haris. Leaves opposite or subopposite, drying pale greenish brown, triplinerved or trinerved, coriaceous, glabrous below; blade not bullate, without domatia, ovate, 8–12(–14) by 3–6(–9) cm, base cuneate or rounded, apex acute with blunt tip; midrib raised on both sides, to 1 mm broad; lateral veins raised on both sides, extending to 2/3–3/4 length of blade; major intercostal veins finely, raised, subscalariform, 3–10 mm apart, less prominent than midrib; minor intercostal veins faint, reticulate; petiole slender, flat above, glabrous, 0.5–2 cm long, 1–2 mm diameter. Inflorescences axillary and/or subterminal, paniculate-cymose with first to second order branching, to 12 cm long; rachis 1–1.5 mm broad, appressed hairy. Flowers drying greyish appressed hairy; pedicel slender, c. 5 mm long; hypanthium 1–2 mm high; perianth lobes lanceolate to elliptic, 3–4 mm long, appressed hairy on both sides; fertile stamens 2–3 mm long, anthers 4-locular, filaments c. 3/4 the length of stamen; glands sessile attach on each side at the middle of filaments, flattish; staminodes 1.5–2 mm long, hastate; ovary globose, c. 1.5 mm diameter, stigma trilobed. Infructescences to 12 cm long. Fruits ellipsoid, 10–13 by 7 mm; cupule cup-shaped, thick, c. 7 mm high, 4 mm diameter, appressed hairy, glabrescent; perianth lobes persistent, indurate, apex truncate, c. 2 by 2 mm; pedicel stout, 3–5 mm long, appressed hairy.
Cultivated in Sarawak (Kuching district), Sabah (Keningau and Sandakan districts), and Kalimantan. This species originated from Sri Lanka and is widely cultivated in the tropics as a source of cinnamon.
In Borneo cultivated at low altitude.
The bark is used as a spice, the oil from the bark is used as a flavouring agent in food and pharmaceutical industries, as medicine and in the perfumery industry (for more detail on usage see Flach & Siemonsma 1999).