LIST OF ILLUSTRATIONS xvii 



FIG. PAGE 



41. Calamagrostis scabra. Plant reduced; spikelet, the floret 



raised from the glumes. (U. S. Dept. Agr. Div. Agrost. Bull. 

 No. 20) 205 



42. Ammophila arenaria. Inflorescence and lower portion of plant, 



X M. (U. S. Dept. Agr. Div. Agrost. Bull No. 14) 206 



43. Notholcus lanatus. Inflorescence, X%; spikelet, the two 



florets raised from the glumes, X 7 210 



44. Avena fatua. Spikelet and a lower floret, X 1 211 



45. Arrhenatherum elatius. Inflorescence, XK; spikelet, X4 212 



46. Capriola Dactylon. Plant showing stolons, X%; spikelet, X7. 215 



47. Bouteloua gracilis. Inflorescence, X 1 ; spikelet, X 10 216 



48. Bulbilis dactyloides. Staminate plant, X K; spikelet, X 4 217 



49. Bulbilis dactyloides. Pistillate plant, X /4; cluster of spikelets 



and floret, X 4 218 



50. Cortaderia argentea. A group of inflorescences greatly reduced; 



glumes of pistillate spikelet (a), florets of pistillate spikelet, 

 (6) glumes (c), and florets (d) of staminate spikelet. (U. S. 

 Dept. Agr. Div. Agrost. Bull. No. 20) 224 



61. Eragrostis cilianensis. Plant, reduced; two spikelets, showing 



variable number of florets; portion of rachilla from which 

 some of the florets have fallen. (U. S. Dept. Agr. Div. 

 Agrost. Bull. No. 17) 225 



62. Distichlis spicata. Staminate plant (at left) and pistillate 



plant (at right) reduced; pistillate and staminate spikelets. . . 226 



53. Dactylis glomerata. Inflorescence, X%', spikelet, X 7 227 



54. Poa pratensis. Plant, X Y^\ spikelet and floret, X 5 229 



55. Festuca elatior. Inflorescence, X Yi; spikelet, X 4 231 



56. Bromus inermis. Inflorescence, X K ; spikelet, X 3 233 



57. Lolium multiflorum. Inflorescence, X M; spikelet, with portion 



of rachis, X 3 237 



58. Agropyron repens. Inflorescence and rhizomes, X M; spikelet, 



X 3 238 



59. Triticum dicoccum. Inflorescence (head), X H; .spikelet with 



a disarticulated joint of the rachis, X 2 239 



60. Triticum sestivum. Inflorescence (head), X K; spikelet with 



portion of attached rachis, X 2 241 



61. Secale cereale. Inflorescence (head), XH; spikelet, X 2 244 



62. Hordeum vulgare. Inflorescence (head), XM; cluster of 3 



spikelets, and a single floret from the back showing the 

 stipiform rachilla, X 2 245 



63. Arundinaria macrosperma. Portion of culm with inflorescence 



reduced; floret, palea showing lodicules, and a caryopsis, 

 reduced. (U. S. Dept. Agr. Div. Agrost. Bull. No. 20) 248 



