LIST OF ILLUSTRATIONS. 



FIG. 



31. RED BARTSIA (Bartsia odontites), parasitic on Wheat - Frontispiece 



PAGE 



1. BLACK BENT (Alopecurus agrestis) 8 



2. FAT HEN (Chenopodium album) 13 



3. ORACHE (Atriplex patuld) 14 



4. SPIKELET OF FRUITS OF WILD OAT (Avenafatua) 16 



5. KNOTGRASS (Polygonum aviculare) 19 



6. FRUIT OF NARROW-LEAVED VETCH (Vicia angustifolia) 21 



7. A. WINGED SEED OF YELLOW RATTLE (Rhinanthus crista-galli) - 22 



B. WINGED SEED OF SPURRY (Spergula arvensis) 22 



C. WINGED FRUIT OF HOGWEED (Heracleum sphondylium) - - 22 



D. WINGED FRUIT OF BROAD-LEAVED DOCK (Rumex obtusifolius) - 22 



8. PLUMED FRUITS 



A. Coltsfoot (Tussilago farfara) 24 



B. Creeping Thistle (Cirsium arvense) - - - - - - 24 



C. Hawkbit (Leontodon hispidus) 24 



D. Dandelion (Taraxacum vulgar e) 24 



E. Groundsel (Senecio vulgaris) 24 



F. Goatsbeard (Tragapogon pratensis) 24 



9. PLUMED SEEDS OF WILLOW-HERB (Epilobium sp.) - - - - 25 

 10. HOOKED FRUITS 



A. Agrimony (Agrimonia eupatoria) 26 



B. Wild Carrot (Daucus carota) - - - - - - - 26 



C. Goosegrass (Galium aparine) 26 



D. Corn Buttercup (Ranunculus arvensis) - - - - -26 

 n. CORN BUTTERCUP (Ranunculus arvensis) 27 



12. SHEPHERD'S NEEDLE (Scandix pecten) 28 



13. BINDWEED (Convolvulus arvensis) - - - - - - -29 



14. CREEPING THISTLE (Cirsium arvense) 3 



15. HORSETAIL (Equisetum arvense) 3 1 



16. COUCH-GRASS (Agropyron repens) 3 2 



17. CORN SOWTHISTLE (Sonchus arvensis) 33 



18. COLTSFOOT (Tussilago farfara) 34 



19. WOODWAX (Gtnista tinctoria) 35 



20. SORREL (Rumex acetosa) 3^ 



ix 



