| genus mucor | (n) type genus of the Mucoraceae; genus of molds having cylindrical or pear-shaped sporangia not limited in location to points where rhizoids develop |
| genus mucuna | (n) genus of tropical herbs and woody vines having trifoliate leaves and showy flowers in axillary clusters, Syn. genus Stizolobium, Stizolobium |
| genus mutisia | (n) genus of South American shrubs or lianas having large flower heads with feathery pappuses |