WEEDS OF FARM LAND 



Poa annua. See Annual Meadow- 

 grass. 



P. pratensis, 185. 



P. trivialis. See Rough-stalked 

 Meadow-grass. 



Poisonous plants, 104-11, 176, 178. 



Poly gala vulgaris, 178, 219. 



Polygonum aviculare. See Knotgrass. 



P. convolvulus. See Black Bindweed. 



P. lapathijolium, 220. 



P. persecaria. See Willow-weed and 

 Persecaria. 



Poor-man's weather-glass, 149. See 

 Scarlet Pimpernel. 



Poppy, 5, 16, 20, 45, 56, 58, 61, 62, 70, 

 76, 81, 83, 85, 87, 104, 117, 128, 

 129, 130, 153, 154, 157, 160, 165, 

 173, 187, 196, 219. 



Destroyer, 47. 



- pale, 131, 133, 157, 218. 



red, 128. See also Papaver 



dubium. 



" Poppyland," 154. 

 Pot cultures, 118. 

 Potash, 60, 199. 

 Potassium chloride, 60. 

 Potatoes, 58. 



Potentilla anserina. See Silverweed. 

 P. reptans. See Creeping Cinquefoil. 

 P. tormentilla. See Tormentil. 

 Poterium sanguisorba, 97. See also 



Salad Burnet. 

 Poultry, 105, 187-205. 

 Prairie sunflower, n. 

 Prevention of weeds, 43-5. 

 Primula veris, 181, 220. 

 Proclaimed plants (weeds), 4, 43. 

 Prostrate habit of grasses, 183, 185. 

 Prunella vulgaris, 129, 181, 220. 

 Prussic acid, 109. 

 Pteris aquilina. See Bracken. 

 Puffballs, 182. 



QUAKER Grass, 178, 179, 180 (fig.), 

 209. 



RADISH, wild, 48, 58, 60, 6r, 62, 85, 87, 



104, 126, 128, 158, 221. 

 Ragged Robin, 151, 177, 216. 

 Ragwort, 16, 65, 104, 109, no, 178, 

 223. 



eradication of, no. 



Ramsons, 38, 112, 113 (fig.), 114, 178, 

 190, 207. 



Ranunculus. See Buttercup. 



R. acris, 26, 220. See also Tall Butter- 

 cup. 



R. arvensis. See Corn Buttercup. 



R. bulbosus, 26, 221. See also Bulbous 

 Buttercup. 



R. hirsutus, 221. 



R. repens, 221. See also Creeping 



Buttercup. 

 Rape, 52. 

 Raphanus raphanistrum. See Wild 



Radish. 



Rapi strum rugosum, n. 

 Rattle, red, 93. 



yellow, 18, 21, 22 (fig.), 64, 91, 93, 



98, 99, 100 (fig.), 101 (fig.), 102, 

 104, 178, 179, 199, 222. 

 Reproduction, sexual, 18. 



vegetative, 18, 31, 86. 

 Reseda, 112. 



R. lutea. See Wild Mignonette. 



R. luteola, 188. 



Reserve food, 85, 87, 97. 



Respiration, 5. 



Restharrow, 18, 179, 217. 



Rhinanthus crista-galli. See Yellow 



Rattle. 



R. major, 99, roo (fig.), 101 (fig.). 

 jR. minor, 98. 



Rhizomes, 88, 89, no, 138, 189. 

 Ribgrass, 2, 4, 182. See also Ribwort 



Plantain. 

 Root crops, 6, 9, 49, 51, 58, 159, 161- 



74- 



Rose-bay, 76. 

 Rosette weeds, 88, 176. 

 Rotation of crops, 6. 

 Rothamsted, 7, 42, 52, 59, 74, 79, 82, 



118, 138, 139, 140, 152, 154. 

 Rumex acetosa, 144. See also Sorrel. 

 R. acetosella. See Sheep's Sorrel. 

 R. conglomeratus, 44, 222. See also 



Sharp Dock. 

 R. crispus, 44, 69, See also Curled 



Dock. 

 R. obtusifolius, 44, 69, 179, 183, 222. 



See also Broad-leaved Dock. 

 R. sanguineus, 26, 177, 222. 

 Running grasses, 49. 

 Rush, 66, 88, 177, 178, 170, 200, 215. 



toad, 20, 76, 183, 215. 

 Russia, 11, 107. 



Rust, 70. 



Ryegrass, 16, 53, 54, 182, 185, 186. 



SAFFRON, meadow, 108, 176, 187. See 

 also Colchicum autumnale, and 

 Autumn Crocus. 



Sainfoin, 55, 96. 



St. John's wort, hairy, 73. 



Salep, 196. 



Salicornia spp., 118. 



Salsify, purple, 73. 



Salt, 67, 68, 99, 102, 118. 



marshes, 118. 



Sandy land, 117, 120, 122, 141. 



