Rhopalocarpus mollis is a tree in the family Sphaerosepalaceae. It is endemic to Madagascar. The specific epithet mollis means 'soft', referring to the very soft indumentum on the leaves' underside.
Rhopalocarpus mollis grows as a tree up to 20m (70feet) tall with a trunk diameter of up to 40cm (20inches). The coriaceous leaves are elliptic in shape and measure up to 13.4cm (05.3inches) long. It is not known to have any flowers. The fleshy fruits are coloured green when fresh. They may be spherical measuring up to 31NaN1 in diameter or two-lobed and measure up to 4.51NaN1 across.
Rhopalocarpus mollis is known only from four locations in the northern regions of Sofia and Analanjirofo. Its habitat is subhumid forests from 500m (1,600feet) to 1000m (3,000feet) altitude.
Rhopalocarpus mollis is threatened by shifting patterns of agriculture. Because the species is used as timber, subsistence harvesting is also a threat.