LIST OF ILLUSTRATIONS. 



FIG. 



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



PAGE 



1. BLACK BENT (Alopecurus agrestis) - - - - - - - 8 



2. FAT HEN (Chenopodium album) 13 



3. ORACHE (Atriplex patula) 14 



4. SPIKELET OF FRUITS OF WILD OAT (Avena fatua) - - - - 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 



11. CORN BUTTERCUP (Ranunculus arvensis) 27 



12. SHEPHERD'S NEEDLE (Scandix pecttn) 28 



13. BINDWEED (Convolvulus arvensis) 29 



14. CREEPING THISTLE (Cirsium arvense) 30 



15. HORSETAIL (Equisetum arvense) 31 



16. COUCH-GRASS (Agropyron repens) 32 



17. CORN SOWTHISTLE (Sonchus arvensis) 33 



18. COLTSFOOT (Tussilago farfara) 34 



19. WOODWAX (Genista tinctoria) 35 



20. SORREL (Rumex acetosa) ---....--36 



