Mimulus ringens. 162 
Mitchella repens . 170 
Mitella nuda . 83 
Mitella diphylla . 83 
Mitreworts. 83 
Monarda didyma . 156 
Moneses uniflora . 125 
Monotropa uniflora . 125 
Moneywort . 135 
Monkeyflower . 162 
Monkshood . 73 
Motherwort . 155 
Mud Plantain . 24 
Mullein, Common .159 
“ Moth . 159 
Mustard . 79 
Myosotis scorpiodes . 150 
Nepeta cataria . 154 
hederacea . 154 
Nightshade . 157 
Nymphaea advena . 66 
Oakesia . 25 
Oats, Wild ... 25 
Oenothera biennis . 120 
“ fruticosa . 120 
Orchis, Green Wood . 48 
“ Purple-fringed . 51 
“ Ragged-fringed . 50 
“ Round-leaved . 49 
Showy . 54 
“ spectabilis . 54 
“ Yellow fringed . 49 
Orontium aquaticum . 21 
Ornithogalum umbellatus . 41 
Orobanche uniflora . 167 
Oswego Tea .. 156 
Oxalis . 100 
Painted-cup . 165 
Panax quinquefolium . 121 
“ trifolium . 121 
Parnassia caroliniana . 82 
Parsnip, Water . 122 
