EXPLANATION OF PLATES. 



Plate I. Fanicicm linearifolium Scribn. : a, spikclet seen from tlie anterior side; 



h, spikelet seen from the dorsal side showing;- second glnme; <■, ante- 

 rior face of third glume showing imperfect palea; d, dorsal view of 

 flowering glume; e, anterior view of flowining glnmo showing palea. 

 II. PaiiicHm c<jui1atera1e Scribn.: «, spikclets seen from the anterior side 

 showing first and second glnmes; b, spikelet seen from the dorsal 

 side showin'g second glume; c, lateral view of spikelet showing base 

 of the fourth glume; d, third glume, Avith the palea; r, flowering 

 glume, dorsal view; /, anterior view of fourth glume showing palea. 



III. Chct'tocMoa latifolia Scribn.: a, spikelet seen from the sidi* showing 



bristle; ?>, spikelet seen from the anterior side showing first and 

 second glumes; c, spikelet seen from the back showing base of first 

 glume, back of second glume, and apex of fourth glume; d, dorsal 

 view of fruiting glnme. 



IV. Stipa ivlUiamsii Scrilui. : n, empty glumes; h, floret. 



V. Sjmroholus paJmeri Scribn.: », empty glumes; h, spikelets with the 



empty glumes removed. 

 VI. Zeuf/ifes priixjJei Scribn.: a, spikelet showing one perfect and one 

 staminate floret; h, empty glnmes of the spikelet; c, flowering 

 glume of the female floret with the awn partly removed showing a 

 joint of the rachilla at g; d, dorsal view of the first empty glume; 

 e, dorsal view of the second empty glume; /, palea of the female 

 floret. 

 VII. Eragrost'is riscosa Scribn.: a, empty glumes; h, spikelet with the 



empty glumes removed ; c, palea. 

 VIII. Pon Juneifolia Scribn.: a, empty glumes; />, florets of spikelet seen 

 from the side; c, dorsal view of flowering glnme; d, palea; c, base 

 of leaf and upper portion of sheath showing palea. 

 IX. Poa hanseni Scribn.: a, empty glumes; h, three florets seen from the 



side; c, ligule. 

 X. Poa airopnrpurea Scribn.: a, empty glumes; h, four florets seen from 

 the side; c, single floret seen fiom the side. 

 XI. I'oa loiujepedinioilata Scribn.: a, empty glumes; /), three tlorets seen 

 from the side; c, base of the leaf and jtortion of sheath showing 

 ligule. 

 XII. Agropyroii clmrri 8cT\}m.: «, empty glumes; />, spikelet with the empty 

 glumes removed. 



XIII. Agtopyron hrcrlJ'oVmm Scribn.: a, empty glnmes; ?>, spikelet with the 



empty glumes removed. 



XIV. Kh/mits capilatiis SciUm.: «, spikelet; /'.one of (he florets. 



XV. EhjmuH Haxicohis Scribn. A Smitli: a, a i)air of empty glumes with the 

 awns removed; h, spikehit with the empty glumes removed and the 

 awns partly cut off. 

 XVI. J'Jhimiis riliatiiH Scribn.: a, empty glumes; h, llorets with the awns 

 partly lemoved. 

 XVII. Kh/mus simplex Scr\\)U. iS: Williams: «, empty glnuu-s; />, spikelet with 

 the empty glumes removed. 



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