114 



17. Spikelets sessile in short terminal spikes; flowering glumes 

 many-nerved 92. Orcutti a 



17. Spikelets in racemes or panicles, these sometimes narrow and 



spike-like 18 



18. Flowering glumes 1- to 3-nerved or nerveless 19 



18. Flowering glumes 5- to many-nerved , 29 



19. Callus or base of the flowering glume hairy or barbate 20 



19. Callus or base of the flowering glume glabrous 23 



20. Hairs extending more or less along the prominent nerves. . 21 



20. Hairs not extending along the nerves ; the glumes glabrous . . 22 



21. Flowering glumes tridentate (rarely entire) , the 3 nerves, or at 



least the middle one, prolonged between the teeth as mucros 

 or very short awns 97. Triodia 



21. Flowering glumes deeply 3-cleft, the lateral divisions narrow, 



the central one prolonged and awn-like 99. Triplasis 



22. Flowering glumes chartaceous, densely hairy on the callus, 



nerves conspicuous. Tall grasses with ample, capillary 

 panicles 100- Redfieldia 



22. Flowering glumes thin-membranaceous, hairs on the callus 



few and short; nerves obscure 118. Colpodium 



23. Empty glumes much longer than the flowering glumes. 



101. DlSSANTHELIUM 



23. Empty glumes shorter than or not much exceeding the flow- 



ering glumes ^ 



24. Flowering glumes coriaceous, shining, rounded on the back 



and subulate pointed; 2 to 4 of the upper glumes empty. 



109. Korycarpus 



24. Flowering glumes not coriaceous 25 



25. Spikelets subterete; flowering glumes rounded on the back; 



empty glumes much shorter than the flowering glumes. 



102. Molinia 



25. Spikelets compressed; flowering glumes keeled, or, if rounded 



on the back, not much larger than the empty glumes. . . 26 



26. Empty glumes nearly equal in length, but very unlike, the 



first narrowly linear and 1-nerved, the second broadly 

 obovate, obtuse, and 3-nerved 104. Eatonia 



26. Empty glumes more or less unequal in length, but similar in 



shape 



27. Flowering glumes falling with the grain in advance of the 



paleas, which remain for a time attached to the continuous 



rachilla; spikelets usually many-flowered.. 103. Eragrostis 



27. Flowering glumes and paleas falling together, carrying with 



them a joint of the articulate rachilla 28 



