Marginal plant

A plant capable of adapting itself to growing either in shallow water or in saturated soil

Mature

Of trees, fully developed

Midrib

Central vein or rib of a leaf

Monoecious

Bearing male and female flowers separately, but on the same plant

Mother bulb

A bulb, especially a Narcissus bulb, which has formed a number of offsets, all of which, however, remain attached, giving the appearance of a single bulb

Mother plant

The parent plant from which all subsequent stock of a particular variety, clone, cultivar or strain have been derived

Mutant

A plant with new characteristics resulting from a heritable change (mutation) in the reproductive cells