XVI 



LIST OF ILLUSTRATIONS 



Fia. Page 



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



fertile spikelet with two staminate spikelets, X 3 171 



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, xVz', spikelet X5 179 



20. Syntherisma sanguinalis. Plant, X H; two views of spikelet, X5. 180 



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



(fertile lemma and palea), X 7 182 



22. Echinochloa f rumentacea. Inflorescence, X V2 ', spikelet, X 5 . . . 183 



23. Chsetochloa lutescens. Inflorescence, X % \ spikelet with sub- 



tending bristles, X 5 184 



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



25. Chaetochloa italica, common millet. Inflorescence, X H; fruit X 5. 185 



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



volucre of bristles, X 5 18G 



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



escence, X !i; spikelet, X 7 187 



28. Stenotaphrum secundatum. Upper portion of culms with 



inflorescence, X H; 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.,BuU No. 20) .. . 189 



30. Oryza sativa. Inflorescence, X li\ 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 K; spikelet and fertile 



floret, X 5 193 



34. Phalaris canariensis. Inflorescence, X J^ ; 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, XH; 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 ]/2\ 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 3^; spikelet, X 5. . 204 



