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34. Cynosurua. —Spike unilateral. Spikelets with pectinated 



bracts at the base. 

 39. Elymus. — Spikelets in pairs on a toothed rachis. Grlumes 



two, collateral. 

 41. Secale. ^Spikelets solitary, parallel to the rachis, with 



two fertile flowers, and a middle rudimentary 



one. Glumes opposite, subulate. The narrow 



glumes and central barren flower distinguish 



this from the nearly allied genus Triticum. 

 — Spikelets solitary, parallel to the rachis, usually 



three- to many-flowered. Grlumes opposite. 

 — Spikelets many-flowered, solitary, subcylindrical, 



parallel to the rachis. Glumes unequal. 

 — Spikelets many-flowered, compressed, at right 



angles to the rachis. Glume solitary, external ; 



a small one occasionally present on the inner 



side of the spikelet. 

 35. Festuca loUacea much resembles Lolium. 



42. Triticum. 



43. Brachypodium. 



44. Lolium. 





Inflorescence paniculate. Panicle compact, or somewhat spicate. 



1. Anthoxanthum. — Spikelets one-flowered. Flower diandrous. 



10. Gastridium. — Gliunes ventricose at the base, not awned. 



Spikelets one-flowered. 



— Spikelets one-flowered, few, distant. Outer 



palea investing the ripe fruit, and terminating 



in a very long, twisted, knee-bent, feathery awn. 



— Spikelets one-flowered. Glumes bifid at the 



apex, with long terminal awns. , 



— For generic character see the following section. 

 — Spikelets two-flowered; the lower imperfect, 

 triandrous or neuter. Lower glume small. 

 28. Poa, some species. 



11. Stipa. 



12. Polypogon. 



17. Aira, prcecox. 

 26. Panicum. 



29. Sclerochloa, some species. 

 .35. Festuca, some species. 



See the following section. 



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