Tree 20-27 m. Leaves below ± late glabrescent; Fruits 4 by 2 cm, apex acute and narrowly, 1.5 mm beaked, basal part contracted into a rather stout pseudostalk 5 mm long;
Asia-Tropical, Idenburg River present, Japen I present
Malesia: Papua Barat (Idenburg River; Japen I.).
May be confounded with M. longipes, a local endemic of SE Papua New Guinea, differing in short-haired indumentum of the leaf bud. Myristica mediovibex var. mediovibex is characterized by long-haired leaf bud, conspicuous short-felty subpersistent indumentum on the lower leaf surface, coriaceous (female) flowers and hard, woody fruits.