GEAMINE^ 717 



1-3 imperfect ones. ' 



80 Distlchlis Flowers dioecicus: floweriog glumes much, compressed 

 laterally, many-nerved, somewhat coriaceous. 



♦+■»*■*'' Glumes 1-3-nerved. 



40 Catabrosa Glumes membranous^ erose-truncate. 



41 tiraphephornm Bachella hirsute with stiff hairs, extended into a 

 hairy appendage : flowering glumes membranous. 



42 Fanlcnlarla Spit^elets several-flowered deciduous, the rachella 

 breaking up into joints : flowering glumes rounded on the backj the 

 6-7 nerves not reaching the scarious mostly obtuse apex. 



48 Fnccinellia Flowering glumes chartaceous, convex on the back, 

 faintly 2-nerved, the nerves not reaphing the obtuse subdenticulate or 

 or mucronulate apex.. 



44 Plenropogon Flowering glumes ch^irtaceous, several-nerved, the 

 nerves not reaching the truncate aiwn^ apex. 



46 Poa Flowering glumes laterally compressed, mostly keeled, 5-nerved, 

 membranous, the margins or nerves .below with cobweby hairs or pu- 

 bescent : palet falling with the gluqie. 



46 Eragrostis Flowering glume S-iierved, keeled, deciduous, leaving 

 the persistent palet. ; 



* • * Spikelets several- flowered :, lowest flowers all perfect : grain 

 adherent to the palet. 



47 Briza Spikelets somewhat heart-shaped : flowering glumes rounded, 

 many-nerved, becoming ventricosej 



48 Festnca Spikelets flattish : flowering glumes rounded on the back, 

 few-nerved, pointed ot awned at th|^ tip : ovary mostly smooth. 



49 Bromns Spikelets flkttened : flowering glumes convex to compressed, 

 mostly awned below the tip : ovaTj* pubescent. 



Tribe viii Hobdeae Spikejiets one- to several-flowered, ses- 

 eile in alternate notchei on the 'bpposite sides of a zigzag rachis, 

 either solitary or several together.; 



* Spikelets single at eabh joint of the rachis. 



60 Scribnerla Spikes slender, solitary: spikelets 1-flowered, almost em- 

 bedded in the notches of the rachiis. 



61 LoLicM Spikelets several-flowered, placed with the edge next to^ the 

 rachis : the inner glumes wantirfg except the terminal one. 



62 Agropyron Spikelets 3- to several-flowered, placed flatwise on the 

 rachis : both glumes present, standing right ana left. 



• • Spikelets 2 or more at each joint of the rachis : glumes anterior, 

 forming a sort of involucre to the spikelet. ' 



68 Hordeum Spike^lets 1- to several-flowered, in three's at eiach joint : 

 lateral spikelets usually sterile. 



64 Elymns Spikelets 1- to seyeraj-flciwered, 2-4 at each joint, all perfect 

 and similar : gluiUes shorter thfan'the spikelets: flowering glumes not 

 long-awned. « 



66 Sitanion Spikelets 1- to several-flowered, 2-4ateach joint, all perfect : 

 glumes very long, usually 2-parted to the base and long-awned : flow- 

 ering glumes long-awned and 2-toothed, or 3-awned. 



