LIST OF ILLUSTRATIONS 



FIG. PAGE 



1. Vegetative part of a grass plant; part of leaf opened out. . 9 



2. Typical complete flower showing calyx, corolla, stamens 



and pistils 9 



3. Grass flower, showing stamens and pistil and the rudi- 



ments of floral envelope 10 



4. A floret at flowering time 11 



5. Two views of a grain 11 



6. Diagram of a flowering branch 12 



7. Diagram of a grass spikelet 12 



8. Generalized spikelet 13 



9. Base of plant and underground parts, roots and rhizomes, 



of Poa pratensis 14 



10. Forms of inflorescence; A, panicle; B, raceme; C, spike.. 18 



11. A, several-flowered spikelet of Bromus secalinus; B, single 



floret 25 



12. A, spikelet of Festuca ovina; B, lemma detached 26 



13. Spikelet of Panicularia septentrionalis 27 



14. Spikelet of Poa pratensis 27 



15. Palea of Pleuropogon californicus 27 



16. Floret of Triodiaflava 28 



17. Lemma of Cottea pappophoroides 28 



18. A, spikelet of Phragmites communis; B, floret 28 



19. Spikelet of Melica mutica 29 



20. Florets of Pappophorum vaginatum 29 



21. A, part of a panicle of Cynosurus cristatus; B, sterile 



spikelet; C, fertile spikelet 30 



22. A, fascicle of three sterile and one fertile spikelet of 



Achyrodes aureum; B, fertile spikelet 31 



23. Pistillate and staminate spikelets of Distichlis spicata. . . 32 



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