116 



INDEX 



Cornmou 79 

 Enchanter's 64 

 Family 78 

 Smaller Enchant- 

 er's 64 

 Nimble Will 14 



Pyrola 70 



One-seeded Bur Cucum- 

 ber 84 



One-sided Winter- 

 green 70 



Onion 25 



Nodding Chickweed 38 Onobrychis 54 



Onoclea 2 

 Ophioglossaceae 4 

 Ophioglossum 4 

 Orange Hawkweed 89 

 Orange-root 42 

 Orchard Grass 11 

 Orchidaceae 27 

 Orchis 29 



Family 27 



Fen 29 



Fringed 28 



Large-leaved 28 



Fescue 12 



Ladies' Tresses 29 



Trillium 26 



Wild Rye 12 

 Nonesuch 54 

 Northern Bedstraw 82 



Prickly Ash 56 



Stitchwort 39 



Willow-herb 64 

 Norway Pine 7 

 Nut, American Blad- 

 der 59 



Bladder 59 



Mocker 31 

 Nymphaea 40 

 Nymphaeaceae 40 

 Nyssa 68 

 Oak 32 



Black 33 



Bur 33 



Chestnut 33 



Fern 3 



Gray 33 



Jerusalem 36 



Mossy-cup 33 



Over-cup 33 



Poison 58 



Red 33 



Swamp White 32 



White 32 



Yellow 33 



Yellow-barked 33 

 Oakesia 26 

 Oak-leaved Goosefoot 370smorhiza 67 



St. Johu's-wort 61 



Touch-me-not 60 

 Pale-leaved Wood Sun- 

 flower 89 

 Panax 66 

 Panic Grass 14 

 Panicled Aster 86 



Dogwood 68 



Hawkweed 89 

 Panicum 14 

 Pansy 63 

 Papaver 43 

 Papaveraceae 43 

 Paper Birch 32 

 Pappoose Root 43 

 Parietaria 33 

 Parnassia 48 

 Parsley Family 66 

 Parsnip 67 



Large Purple Fringed Cow 67 



28 



Long-bracted 28 



Ragged Fringed 28 



Rein 28 



Round-leaved 28 



Showy 29 



Smaller Purple 

 Fringed 28 



Small Wood 28 



Tall Green 28 



White Bog 28 



White Fringed 28 

 Orobanchaceae 81 

 Orobanche 81 

 Orpine 47 



American 48 



Family 47 



Garden 47 

 Oryzopsis 14 

 Osier 30 



Oat 100 



Grass 10 



Narrow False 16 



Purple 13 

 Oats, Water 16 

 Oenothera 65 

 Old Field Birch 32 

 Old-witch Grass 14 

 Oleaceae 72 

 Oleaster Family 64 

 Olive Family 72 

 Onagraceae 64 

 One-flowered Cancer- 

 root 81 



Osmunda 3 

 Osmundaceae 3 

 Ostrich Fern 2 

 Ostrya 32 

 Over-cup Oak 33 

 Oxalidaceae 56 

 Oxalis 56 

 Ox-eye 89 



Daisy 87 

 Painted Trillium 26 

 Pale Corydalis 44 



Laurel 69 



Manna Grass 13 



Persicaria 35 



Early Meadow 68 



Golden Meadow 68 



Poison 67 



Water 68 



Wild 67 

 Partridge Berry 82 

 Pastinaca 67 

 Pasture Rose 52 

 Patience Dock 36 

 Pea, Beach 54 



Everlasting 54 



Marsh 54 

 Peanut, Hog 53 

 Pearly Everlasting 85 

 Pediculai'is 79 

 Pellaea 3 

 Pellitory 33 

 Penny Cress 47 

 Pennyroyal 76 



American 76 



Bastard 78 



Mock 76 

 Pennywort, Water 67 

 Penthorum 47 

 Pentstemon 80 

 Pepper, Water 35 

 Peppergrass 46 



Wild 46 

 Pepperidge 68 

 Peppermint 76 

 Pepper-root 45 



Cut-leaved 45 



Large 45 



Two-leaved 45 

 Pepperwort 46 



