x LIST OF ILLUSTRATIONS 



FIG. PAGE 



24. Staminate and pistillate spikelets of Scleropogon brevi- 



folius 32 



25. A, part of a spike of Agropyron repens; B, part of rachis 



seen from the edge, all but two spikelets removed .... 34 



26. Spikelet of Triticum cestivum 35 



27. Part of a spike of Lolium multiflorum 36 



28. A, part of a spike of Lepturus cylindricus; B, diagram of 



rachis, spikelets removed; above, diagram of single 

 joint 37 



29. A, pair of spikelets of Elymus virginicus; B, diagrammatic 



figure of the pair of spikelets 38 



30. Joint of spike of Hordeum nodosum 40 



31. A, spikelet of Avena fatua; B, floret 42 



32. Spikelet of Trisetum spicatum 43 



33. Spikelet of Danthonia spicata; floret above 43 



34. A, spikelet of Notholcus lanatus; B, pair of florets 44 



35. Spikelet of Calamagrostis canadensis 46 



36. Spikelet of Agrostis hiemalis 47 



37. Spikelet of Sporobolus airoides 47 



38. Spikelet of Phleum pratense; floret above 48 



39. Spikelet of Alopecurus geniculatus 48 



40. Pair of spikelets, sterile and fertile (spread apart) of 



Lycurus phleoides 49 



41. Spikelet of Muhlenbergia foliosa 50 



42. A, spikelet of Muhlenbergia Schreberi; B, branchlet with 



the minute glumes of two spikelets from which florets 



have fallen 50 



43. A, spikelet of Milium effusum; B, floret 50 



44. A, glumes, and B, floret of Oryzopsis racemosa 51 



45. A, glumes, and B, floret of Stipa spartea 51 



46. Spikelet of Aristida dichotoma 51 



47. A, spikelet of Eleusine indica; B, inflorescence 55 



48. A, spikelet of Capriola Dactylon; B, inflorescence 55 



49. A, spikelet of Chloris latisquamea; B, fertile lemma spread 



out; C, sterile lemma spread out; D, inflorescence. ... 56 



