446 INDEX 



Planlago lanceolata, 24, 39, 108, 

 139, 140, 141, 196, 359, 369, 

 370, 398 



major i 108, 198, 398 



media, 39, 198, 398 



sp., 27, 196 



Plantain, II, 27, 43, 140, 146, 196, 

 233, 346, 349 



Broad-leaved, 39, 108, 198, 



398 



Greater, 198, 398 



Hoary, 198, 398 



Narrow-leaved, 2A 



Ribwort, 39, 108^196, 398 



-Water, 335, 403 



Plasmodiophora brassicce, I o, 1 1 



Ploughing, 33, 41 



Plutella mactilipennis, 10, n 



Poa annua, 11, 27, 129, 233, 346, 



349, 407 



pratensis, 39 



trii'ialis, 39 



Poisonous weeds, 13, 276 

 PolygonacecB, 114, 201, 308, 331, 



401 

 Polygonum Aviculare, 47, 115, 369, 



401 

 Convolvulus, ii, 13, 47, 116, 



369, 401 



lapathifolium, 369, 370 



Persicaria, 8, 27, 114, 369, 



401 

 Pond weed, 336, 403, 404 



Canadian, 332, 403 



Curly, 404 



Floating, 404 



Lucid, 404 



Opposite-leaved, 404 



Small, 404 



- Various-leaved, 404 

 Poor- Man's Weather-Glass, 113, 400 

 Poppies, spraying of, 47 

 Poppy, 5, 24, 233 



Common Red, 53, 281 



Scarlet, 385 



Destroyer, 3J, 55 



Long Smooth-headed, 53, 385 



Opium, 53, 281 



Shirley, 5 



Potamogeton, 323, 336 



crispus, 338, 404 



densus, 338, 404 



heterophyllus , 336, 404 



lucens, 338, 404 



Potamogeton natans, 336, 404 

 perfoliatus , 338, 404 



polygonifolius, 336, 404 



pitsillus, 338, 404 



Potash, 145, 146 

 Potatoes, 48, 307 



Potentilla Anserina, 78, 140, 390 



reptans, 79, 164, 390 



Tormentilla, 165, 390 

 Polerium officinale, 165, 391 



Sanguisorba, 165, 391 



Poverty weed, 186 

 Prevention of seeding, 30 

 of weeds, 29 



Prickly Saltwort, n 

 Prinnda vert's, 201, 400 

 Primulacece, 113, 201, 400 

 Prunella alba, 359 



vulgaris, 139, 140, 199, 369, 

 370, 400 



Prunus laurocerasus , 292, 390 

 Pteris aquilina, 151, 226, 408 

 Pttccina graminis, 10, 12, 155 



hieracii, 12 



pringsheimiana, 1 2 



Puff-ball, 348 

 Purging Flax, 158, 388 

 Purple Orchis, 208, 403 



QUACK, 132 



Quaking Grass, 28, 39, 146, 222, 



407 

 Quality of soils indicated by weeds, 



27 



Queen of the Meadow, 163, 390 

 Quercus, 313 



Kobur, 403 



RAGGED ROBIN, 28, 156, 387 



Ragweed. See Ragwort 



Ragwort, 6, 12, 28,40,42, 150, 187, 



189, 23?, 395 



Rain as distributor of weed seeds, 19 

 Ramsons, 211, 404 

 RanuncnlacecB, 50, 151, 276, 324, 



384 

 Ranunculus acrts, 13, 39, 140, 141, 



i5 2 279, 369, 370, 385 

 aqnatilis, 385 



- arvensis, 52, 280, 385 



bulbosus, 39, 140, 152, 279, 385 



Ficaria, 152, 280, 385 

 Flammula, 155, 279, 323, 325, 



