68 THE GRASSES 



33 Terminal flower perfect 34 



33 Terminal flower abo tive, or a mere pedical 36 



34 Palese entire, outer one mucronate 38 



34 Glumes unequal, like the lower abortive palese 59 Panicutn 



34 Glumes equal, longer than the palese 55 Phalaris 



34 Lower palese truncate, mucronate, inner bifid 38 Uniola 



34 Flowers silky-bearded on the rachis 39 Phragrrfites 



34 Spikelets terete, palese 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 palese laterally compressed 32 Bryzopyrum 



35 Scales two, styleB two , 36 Pestuca 



35 Scales and styles three 40 Arundinaria 



36 Panicle contracted 37 



36 Panicle large, diffuse 3o MelicB 



37 Lower palea one-pointed or mucronate 38 



37 Lower palea pointless 29 Eatonia 



37 Lower palea three-cleft 24 Tricuspis 



37 Lower palea awnless . , 25 Daflthonia 



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 Lolium 



41 Glumes two, in each spikelet 43 Triticum 



42 Glumes collateral, spikelets in twos or more 46 Elymus 



42 Glumes opposite, spikelets solitary 45 Seeale 



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 Spikelets 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 racemed, sleflder 23 Leptochloa 



The grasses which we purpose to describe in the follow- 

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



