Asia-Tropical, Northern New Guinea present, Papua Barat present, Papua New Guinea present, W Sepik Prov present, area of Jayapura present
Malesia: northern New Guinea ( Papua Barat: in the area of Jayapura; Papua New Guinea: W Sepik Prov.).
This subspecies may resemble M. lancifolia (with a similar faint venation), but differs in smaller fruits, with the seeds not transversely positioned, and the leaves papillose below. The male flowers of subsp. siphonantha resemble those of M. cornuti-flora, a species with a stalked inflorescence and dotted lower leaf surface.