18 



■97. Florets 2. Valves shorter than the glumes 



Aira caryophyllea. 

 Florets 3-6. Valves exserted from the glumes ... 



Avenastruni. 

 98. Styles distinctly lateral on a hairy 2-3 lobed appendage 



of the ovary. Spikelets rather large Bromus. 



No hairy 2-3 lobed appendages on the top of the ovary 99 

 .99. Valves 2 cleft or 2 lobed with or without an awn or 



mucro from the sinus 100 



Valve entire or minutely billd, awned or awnless ... 103 



100. Florets 2 101 



Florets more than 2, uppermost often reduced 102 



101. Top of the ovary glabrous. Seed adnate to the thin 



pericarp Pentaschistis. 



Top of the ovary hairy. Seeds free except along the 

 hilura inside the crustaceoas pericarp ... Pentameris. 



102. Annual or subperennial. Uppermost of the 6-7 small 



florets exserted. Awn straight or Schismus. 



Perennial, very rarely annual. Florets exceeded by the 

 glumes or more or less equalling them. Awn kneed 

 or reduced to a mucro Danthonia. 



103. Valves awned 104 



Valves awnless (occasional spikelets in Achncria selilolia 



are awned) 110 



104. Valves 7-9 nerved 105 



Valves 5 nerved 106 



105. Spikelets subsessile in a simple raceme or false spike ... 



Brachypodiuni. 



Spikelets in open or contracted panicles. (See also 108 



and 115) Festuca. 



106. Glumes very unequal, lower sometimes obsolete. Awn 



of valve long Vulpla. 



Glumes not very unequal. Awn of valve short or reduced 

 to a mucro 107 



107. Valves keeled and keel ciliate Daclylis glomerata. 



Valves not keeled, or if keeled, then keel not ciliate... 108 



108. Perennial. Panicle not spiciform Festuca. 



Annual. Panicle spiciform 109 



109. Rachilla glabrous or almost so Koeleria phleoides. 



Rachilla ciliate Trisetum pumiluni. 



110. Spikelets in lax panicles or racemes, generally nodding 



on long capillary pedicels. Valves broadly cordate- 

 ovate, boat shaped Briza. 



Valves not broadly cordate-ovate, boat shaped, etc. Ill 



