88 IOWA ACADEMY OF SCIENCES. 



2. Length, li-lf"; tawny yellow, brown or nearly black; transversely 

 wrinkled. 



' Setaria glauca, Beauv. 



II. Flowering glume and palet membranaceous, glume truncate; palet 

 2-nerved; length of flowering glume about f". 

 1" Phleum pratense, L. 



EXPLxVNATION OF PLATE. 



1. Setaria viridis (upper surface). 



2. Setaria viridis (under surface). 



y. Setaria viridis (with glumes removed). 



4. Setaria glauca (upper surface). 



5. Setaria glauca (under surface). 



6. Setaria glauca (gXwmQs vemoYeA) . 



7. Panicum glabrum. 



8. Panicum sanguinale. 



9. Panicum crus-galli. 



10. Panictmi crus-galli (glumes removed). 



11. Pla7itago lanceolata (convex ta.ce). 



12. Plantago lanceolata (concave face). 



13. Plantago rugelii. 



14. Amarantus retroflexus. 



15. Amarantus albus. 



16. Amarantus blitoides. 



17. Polygonum aviculare. 



18. Chenopodium album (without utricle). 



19. Polygonum persicaria, 



20. Polygonum hydrox)ip>ef. 



21. Chenopodium album (with utricle). 



22. Polygonum acre. 



24. Rumex acetosella. 



25. Ambrosia artemisioefelia (naked). 

 37. Rumex crisinis. 



■28. Anthemis cotula. 



•29. Verbena bracteosa. 



30. Chrysanthemum leucanthemum . 



NATURAL SIZE DRAWINGS. 



31. Setaria viridis. 



32. Setaria glauca, 



33. Panicum glabrum. 



34. Panicum sangtiinale. 



35. Panicum crus-galli. 



36. Plantago lanceolata. 



37. Plantago rtigelii. 



*S. glauca. S. viridis and P. crus-galli frequently appear naked; P. crus-galli and S. 

 glauca are orbicular, flat on one side, well rounded on the other, and are quite difB- 

 oult to separate. S. viridis is oblong ovoid. All these are light green in color. 



10 This rery frequently occurs naked. Then It is light brown, ovoid, Vi" long. 



