- lucerne
- longan
- lotos
- lousewort
- love-apple
- lungwort
- lupin
- macropodous
- macrospore
- madonna lily
- mahogany
- maidenhair
- macrocarpous
- macrophyte
- macrosporangium
- madder
- maize
- mangrove
- magnolia
- mallow
- malvaceous
- mandarin orange
- mangel
- maple
- mangel-wurzel
- mango
- mangosteen
- marigold
- marjoram
- marge
- marrow
- marsh mallow
- marshmallow
- mangold
- manioc
- marguerite
- may
- medulla
- mesocarp
- medullary
- megaspore
- midrib
- mignonette
- milfoil
- mesophyll
- milkweed
- millet
- mint
- microspore
- mimosa
- mistletoe
- monandrous
- monkey-bread
- monocarpic
- monocarpous
- monocotyledon
- moneywort
- monocarp
- monocotyledonous
- monogynous
- moonflower
- mule
- morel
- morning-glory
- mosaic
- mountain ash
- multiflorous
- mum
- myosotis
- naiad
- mustard
- mycelium
- myrtaceous
- myrtle
- narcissi
- narcissus
- nard
- nasturtium
- nectarine
- nenuphar
- nervate
- nervation
- nervelessness
- nectar
- nectariferous
- nepenthes
- nerve
- nerveless
- nettle
- neuter
- neutral
- nightshade
- nonsesuch
- node
- nodule
- non-com
- nonsuch
- nucellus
- nuciferous
- nuclei