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PONTEDERIACEAE 24 



Pontederia 24 



Poplar 29 



Poppy 38 



Poppy Family 38 



Populus 29 



Portulaca 35 



PORTULACACEAE 35 



Potamogeton 15 



Potentilla 43,44 



Poverty Grass 17 



Prairie Willow 29 



Prenanthes 72 



Prickly Ash 48 



Prickly Gooseberry 41 



Prickly Lettuce 72 



Prickly Pear 52 



Primrose-Leaved Violet.,.. 52 



Primrose 53, 57 



Primrose Family 57 



Primulaceae 57 



Prince's Feather 32 



Prince's Pine 56 



Privet 58 



Proserpinaca 53 



Prunella 60 



Prunus 45 



Psedera 50 



Ptelea 48 



Pteridophyta 11 



Pteris 11 



Puccoon 60 



Pulse Family 45 



Purple Amaranth 33 



Purple Avens 44 



Purple Azalea 56 



Purple Flowering Raspberry 44 



Purple Loosestrife 57 



Purple Milkweed 58 



Purple Stramonium 62 



Purplish Cudweed 69 



Purslane 35, 48 



Purslane Family 35 



Purslane Speedwell 63 



Putty-Root 28 



Pycnanthemum 61 



Pyrola 56 



Pyrus 42 



Quaking Aspen 29 



Quassia Family 48 



Queen of the Meadow 44 



Queen of the Prairie 44 



Quercus 30 



Quick Grass 20 



Quillwort 14 



Rabbit-Foot Clover 45 



Radicula 39 



Radish 39 



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Ragged-Fringed Orchis 28 



Ragged Robin 34 



Ragweed 69 



Ragwort 71 



Ramsted 63 



Ranunculus 35 



Ranunculaceae 35 



Raphanus 39 



Raspberry 44 



Rattle-Box 45 



Rattlesnake Grass 19 



Rattlesnake Plantain 28 



Rattlesnake-Root 72 



Rattlesnake Weed 72 



Red Ash 58 



Red Baneberry 37 



Red-Berried Elder 66 



Red Birch 30 



Red Cedar 15 



Red Cherry 45 



Red Clover 45 



Red Currant 41 



Red-Fruited Hawthorn 42 



Red Lychnis 34 



Red Maple 50 



Red Mulberry 31 



Red Oak 30 



Red Osier Dogwood 55 



Red Pine 14 



Red Raspberry 44 



Red Root 50 



Red-Seeded Dandelion 71 



Red Spruce 14 



Red Top 18,19 



Reed Bent Grass 18 



Reed Grass 18,19 



Reed Meadow Grass 19 



Rhamnaceae 50 



Rhododendron 56 



Rhodora 56 



Rhus 49 



Ribes 41 



Rib Grass 64 



Rich-Weed 62 



Ricinus 48 



River-Bank Grape 50 



River Birch 30 



Robinia 46 



Robin's Plantain 68 



Rock Brake 11 



Rock Cress 40 



Rocket 39 



Rock Maple 50 



Rockrose 51 



Rockrose Family 51 



Roman Wormwood 69 



Rosa 45 



ROSACEAE 41 



Rose 45 



84 



