Tree 8-25 m. Leaves (thinly) coriaceous, elliptic-oblong or oblong-lanceolate, 8-20 by 2-6 cm, base rounded or short-acute, apex acute(-acuminate) (sometimes ± blunt); Inflorescences between the leaves or below, with brown-red hairs 0.5(-l) mm, of the Knema-typt: Fruits solitary, almost sessile, broadly ellipsoid, 2.5-3.5(-3.8) by 2-2.4 cm (remnant of the style ± acute, glabrous, blackish brown, 0.5 mm long), hairs mealy, 0.2-0.5 mm;
Asia-Tropical: Borneo present (Brunei present), C & E Kalimantan present, NE Sarawak present
Malesia: Borneo (Brunei; NE Sarawak, 2nd Div.; C & E Kalimantan).
Myristica smythiesii is close to M. beccarii and M. cinnamomea, all three species with an indumentum of (pale) cinnamon scale-like hairs on the lower leaf surface. Myristica beccarii differs in its usually rounded or emarginate leaf base, coriaceous leaves with stronger and more distinct nerves, and somewhat stouter twigs; M. cinna-momea is distinguishable by its longer petioles, a branched-type inflorescence with a peduncle, angular perianth buds, and larger fruits with thick pericarp.