ILLUSTRATIONS. 



TEXT FIGURES. 



Page. 



Fig. 1. A spikelet of Poa 15 



2. Unrubbed Kentucky Vjluegrass seed {Poa pratensw) 17 



3. Seeds of Kentucky bluegrass {Poa pratensis) 18 



4. Different forms of commercial seeds of Kentucky bluegrass {Poa 



pratensis) 22 



5. Commercial seeds of Canada bluegrass {Poa compressa) 24 



6. Seeds of rough-stalked meadow grass {Poa trivialis) 25 



7. Seeds of wood meadow grass {Poa nemoralis) 26 



8. Seeds of fowl meadow grass {Poa trlflora) 27 



9. Seeds of Texas bluegrass {Poa araehnifera) , 28 



10. A cluster of Texas bluegrass seeds matted by the webby fibers 29 



11. Seeds of annual meadow grass {Poa annua) 29 



12. Seeds of alpine meadow grass {Poa alpina) 30 



13. Seeds of Poa sudetica 30 



14. Seeds of nerved manna grass {Panicularia nervata) 31 



15. Seeds of water meadow grass {Panicularia americana) 31 



16. Seeds of shepherd' s-purse ( Bursa bursa-pastoris) 32 



1 7. Seeds of peppergrass ( Lepidium virginicum ) 32 



18. Seeds of mouse-ear chickweed ( Ceraslium ndgatum) 32 



19. Seeds of chickweeds {Alsine media and A. graminea) 33 



20. Seeds of Canada thistle ( Carduus arvensis) 33 



21. Prickles often found with bluegrass seed 33 



22. Seeds of dandelion ( Taraxacum taraxacum ) 34 



23. Seeds of scentless camomile ( Matricaria inodora) .34 



24. Seeds of hawkweed {Hieracium sp. ) ,. 34 



25. Seeds of dog fennel ( Anthemis cotula) 35 



26. Seeds of lamb's-quarters ( Chenopodium album ) 35 



27. Seeds of rib-grass {Plantago lanceolata) 35 



28. Seeds of curled dock ( Rumex crispus) 36 



29. Seeds of sorrel { Rumex acetosella) 36 



30. Seeds of corn speedwell ( Veronica aj-vensis) 36 



31. Seeds of slender rush {Juncus tenuis) 37 



32. Seeds of field rush {Juncoides campestre) 37 



33. Seeds of wood rush {Juncoides albida) 37 



34. Seeds of sedge ( Carex cephalophora) 38 



35. Ergot { Claviceps purpurea) of Kentucky bluegrass 38 



7 



