Climber to 40 m. Branchlets puberulent or, rarely, tomentose, usually becoming glabrous with age. Leaves: Inflorescence axillary and terminal, 1-13 cm long; Sepals oblong, obtuse to rounded, 0.7-1.8 times as long as wide, 0.7-4.3 by 0.9-2.4 mm; Stamens inserted 1.7-3 mm from base, 0.4-0.7 of tube length; Ovaries 0.7-1.2 mm long, pubescent; Fruit glabrous to tomentose, 8.4-30 cm by 2.8-20 mm. Seeds linear;
Asia-Tropical: Maluku (Maluku present); New Guinea present; Sulawesi (Sulawesi present), Australasia: Queensland (Queensland present), Bougainville present, New Britain present, Solomon Islands present
Solomon Islands, Australia (Queensland); in Malesia: Sulawesi, Moluccas, New Guinea (including New Britain and Bougainville).
The scant Sulawesi material appears to belong to both M. serpyllifolius and M. rhombifolius although in this case it then becomes difficult to assign the immature material to one or the other.