xvi LIST OF ILLUSTRATIONS 



FIG. PAGE 



17. Holcus halepensis. Inflorescence and rhizomes, X /^; a terminal 



fertile spikelet with two staminate spikelets, X3 171 



18. Hilaria cenchroides. Plant reduced; group of spikelets, a 



staminate spikelet, a pistillate spikelet, X 5. (U. S. Dept. 

 Agr. Div. Agrost. Bull. No. 20) 174 



19. Paspalum dilatatum. Inflorescence, XK; spikelet X5 179 



20. Syntherisma sanguinalis. Plant, X Vz', two views of spikelet, X5. 180 



21. Panicum miliaceum. Inflorescence, X %; spikelet and fruit 



(fertile lemma and palea), X 7 182 



22. Echinochloa frumentacea. Inflorescence, X M ; spikelet, X 5 ... 183 



23. Cha3tochloa lutescens. Inflorescence, X M ', spikelet with sub- 



tending bristles, X 5 184 



24. Chsetochloa italica, Hungarian-grass. Inflorescence, X % 185 



25. Chsetochloa italica, common millet. Inflorescence, X K ; fruit X 5. 185 



26. Pennisetum glaucum. Inflorescence, X M J spikelet with in- 



volucre of bristles, X 5 186 



27. Cenchrus carolinianus. Upper portion of plant with inflor- 



escence, X 23; spikelet, X 7 187 



28. Stenotaphrum secundatum. Upper portion of culms with 



inflorescence, X % ', spikelet, X 5 188 



29. Pharus glaber. Plant reduced; branchlet of inflorescence with 



a sessile pistillate and pedicelled staminate spikelet, and a 

 fertile floret. (U. S. Dept. Agr. Div. Agrost.,Bull No. 20) ... 189 



30. Oryza sativa. Inflorescence, X K; spikelet, X 3 191 



31. Zizania palustris. Inflorescence, much reduced. (U. S. Dept. 



Agr. Div. Agrost. Bull. No. 14) 191 



32. Anthoxanthum odoratum. Inflorescence, X 1; spikelet, the two 



sterile lemmas and the fertile floret, X 5 192 



33. Phalaris arundinacea. Inflorescence, X %', spikelet and fertile 



floret, X 5 193 



34. Phalaris canariensis. Inflorescence, X}4', glumes and fertile 



floret with the pair of sterile lemmas, X 5 194 



35. Aristida longiseta. Spikelet, the fertile lemma raised from the 



glumes, X 1 199 



36. Stipa spartea. Mature fertile lemma (fruit) with twisted awn, xl. 200 



37. Muhlenbergia gracilis. Plant, XK; spikelet, the floret raised 



from the glumes; glumes and floret. (U. S. Dept. Agr. Div. 

 Bot. Bull. No. 26) 201 



38. Phleum pratense. Inflorescence, X K; glumes and mature 



floret, X 5 202 



39. Alopecurus pratensis. Plant reduced; spikelet and floret. 



(U. S. Dept. Agr. Div. Agrost. Bull. No. 20) 203 



40. Agrostis alba. Inflorescence and rhizomes, X K ; spikelet, X 5. . 204 



