Magnolia:  nobility ... sweetness ... beauty ...

Maple:  keys to my heart ...

Marigold:  cruelty ... grief ... jealousy ...

Mint:  warm feelings ... wisdom ...

Mistletoe:  kiss me ... affection ... to surmount difficulties ... sacred plant of India ....

Mock Orange:  deceit ...

Monkshood:  beware ... a deadly foe is near ...

Morning Glory:  love of life ...

Moss:  maternal love ...

Myrtle:  eloquence ... joy ...  love and marriage ...