274 



INDEX 



Page 



Pokeweed 5, 59, 64, 72 



Family 172 



POLEMONIACEAE 137. 214 



Pollen 129, f. 129, 130 



Pollinium 129 



Polycotyledonous 134 



Polygamous flower 126 



POLYGONACEAE 136, 162-167 



Polygonum 80 



acre 73 



aviculare 71, 164, f. 165 



Convolvulus. . .28,58, 68, f. 116, 166 



erectum 164 



Hydropiper 166 



Vitality 38 



hydropiperoides 72, 166 



lapathifolium 166, f. 167 



Muhlenbergii 52, 74, 165 



fennsylvanicum 



28, 70, 165, 166, f. 167 

 Persicaria 28, 33, 56, 71, 165, f. 166 



Germination 42 



ramosissimum 165 



virginianum f . 22 



Polypetalous flower 126, f. 128 



POLYPODIACEAE 135, 137 



Polypogon monspeliensis 68 



Pome 133 



Poplar 126 



Poppy 64, 130 



Family 178-179 



Mexican 73 



Opium 179 



Prickly 59, 60, 64, 73 



Smooth-pointed corn 179 



Wild 116 



Porcupine Grass 146 



Portulaca 



grandiflora 176 



oleracea .38, 79, 177, f. 178 



Vitality 38 



PORTULACACEAE 136, 176-177 



Potassium sulphide, as herbicide 95 



Potato 119 



Wild 211 



Sweet 5, 116, 117, 210 



Potato Scab 99 



Potenlilla 



Anserina 73, 186 



argenlea. Germination 40 



fruticosa 186 



monspeliensis .. .28, 33, 185, f. 186 



Poverty grass 59, 73, 146-147 



Southern 51 



Prairie 



Bitterweed 115 



Ragweed 73 



Rose 187 



Sunflower 238-239 



Thistle 247-248 



Prickly 



Lettuce 10, 13, 24, 58, 59, 67 



71,84, 115, 253-254, f. 253 



Eradication 96 



Poppy 59, 60, 64, 73 



Sida 201 



Page 

 Primrose 



Evening 13, 73, 205, f. 205 



Family 204-205 



Prostrate, Pigweed 171, f. 172 



Eradication 96 



Pleris aquilina 57, 68, 137, f. 138 



Puccinia suaveolens 103 



Puccoon 216 



Hoary 216-217 



Rough 217 



Pulse Family 36, 187-191 



Pumpkin 1 



Pumpkin-peg f. 134 



Purity of seeds, Standard of . . . .47-49 

 Purple 



Fireweed 70 



Foxglove 64, 224-225 



Gaura 204 



Jimson Weed 64, 71 



Stramonium 222-223, f. 223 



Purple-flowered Rush 73 



Purslane 10, 24, 58, 65, 73, 78, 79, 



82, 130, 132, 177, f. 178,225 



Eradication 100 



Family 176-177 



Milk 58 



Pusley 58, 80, 81 



Pyricularia gricea 103 



Pyxis 132 



Quack Grass 8, 10, 12, 13, 19, 23, 

 27, 31, 46, 58, 65, 87, 93, 



116, 117, 153-155, f. 154 



Distribution 82 



Eradication 87, 96, 97 



Germination 42 



Legislation 43 



Rootstock 118 



Seed f, 37 



Stem 117 



Quaking Brome Grass 57, 68, 76 



Queen Anne's Lace 207 



Quercus rubra, Vitality of 38 



Raceme 124, f. 125 



Radicle 134 



Radicula Armor acia 184 



Radish 80 



Wild 24 



Ragged Robin 175 



Ragweed 10, 11, 17, 24, 25, 31, 



33, 51, 57, 64, 67, 87, f. 125 



Eradication 95, 100 



False 59 



Great 11, 13,16, 26, 58, 59', 62, 



73, 87, 115, 234 



Germination 38, 41, 42 



Perennial 59 



Prairie 73 



Small 13, f. 17, 26, 58, 59, 62, - 

 73, 100, 115, 234, f. 235, f. 236 



Western 234-235 



Germination 39-40 



Railways, as weed-carriers 24-25 



RANUNCULACEAE . . . 136, 177-178 

 Ranunculus 



abortivus 177-178 



acris 178 



fascicularis 178 



