68 THE GRASSES 



33 Terminal flower perfect 34. 



33 Terminal flower abo tive, or a mere pedical 36 



34 Paleae entire, outer one mucronate . . 35 



34 Glumes unequal, like the lower abortive paleae 59 Panicum 



34 Glumes equal, longer than the paleae 55 Phalaris 



34 Lower paleae truncate, mucronate, inner bifid 38 Uniola 



34 Flowers silky-bearded on the rachis 39 Phragmites 



34 Spikelets terete, paleae seven-nerved 31 Glyceria 



34 Spikelets two to six, five nerved 33 Poa 



34 Spikelets two to twenty, three nerved 34 Eragrostis 



34 Spikelets flat, lower paleae laterally compressed 32 Bryzopyrum 



35 Scales two, styles two 36 Festuca 



35 Scales and styles three 40 Arunitinaria 



36 Panicle contracted 37 



36 Panicle large, diif use 3o Melic* 



37 Lower palea one-pointed or mucronate 38 



37 Lower palea pointless 29 Eatnnia 



37 Lower palea three-cleft 24 Tricuspis 



37 Lower palea awnless . , 25 Danthonia 



38 Stamens three 28 Koehleria 



38 Stamens two 26 Diarrhena 



39 Spikelets two ranked 37 



39 Spikelets unilateral 43 



40 Glumes broad 41 



40 Glumes subulate 42 



40 Glumes none 46 Gymnostichum 



41 Glumes two, in the upper spikelet only 42 ttolium 



41 Glumes two, in each spikelet 43 Triticum 



42 Glumes collateral, spikelets in twos or more ... 46 Elymus 



42 Glumes opposite, spikelets solitary 45 Secale 



43 One perfect among several neutral ones ." 17 Ctenium 



43 One perfect flower below several neutral ones 44 



43 Spikelets conglomerate or paniculate 27 Dactylis 



43 Spikelets with more than one perfect flower 45 



44 Spik|lets dense , 18 Bouteloua 



44 Spikes filiform, racemed 19 Gymnopogon 



44 Spikes slender, digitate 20 Cynodon 



45 Spikes digitate, glumes and palea awnless, blunt 22 Eleusine 



45 Spikes racerned, slender 23 Leptochloa 



The grasses which we purpose to describe in the follow- 

 ing pages, are named in the following list. It is intended to 



