The inflorescence is a large panicle, sometimes flat-topped like a corymb, growing from the leaf axils or at the ends of branches.

The flowers have five narrow petals in shades of green, white, or yellow, borne in a hairy, cup-like calyx with five lobes or five separate sepals.

It is yellow, orange, or red, and sometimes fleshy, but it lacks the pulp present in some related fruits, notably citrus.

It is the only genus of the subtribe Micromelinae that are known technically as the "very remote citroid fruit trees".

[2][4][7] The following is a list of species and varieties accepted at the Plants of the World Online as at July 2020:[8] M. minutum is used as a traditional medicine in Fiji, and in Malaysia it is used to treat fever and ringworm.