EXPLANATION OF PLATE X. 



TRIODIA. (1) Magnified spikelet of T. seslerioides ; (2) the same displayed 

 and the lowest flower open; (3) back view of the flowering glume spread 

 out. 



GRAPHEPHORUM. (1) A magnified spikelet of G. melicoides, displayed ; 



(2) a part of the hairy rhachis and one flower of the same. 

 DIARRHENA. (1) A spikelet of D. Americana, enlarged; (2) the grain 



in its glume and palet. 



DACT YLIS. A spikelet of D. glomerata magnified and displayed. 



KCELERIA. (1) A magnified spikelet of K. cristata, expanded, showing 

 the empty glumes, the three flowers, and a rudiment; (2) lower half of a 

 flowering glume, partly spread open ; it is much more folded and keeled 

 in its natural condition. 



EATONIA. A magnified spikelet of E. obtusata, expanded, showing the 

 empty glumes, the two flowers, and a rudiment. 



MELICA. A magnified spikelet of M. mutica, expanded, showing the empty 

 glumes, two perfect flowers, and an abortive one. 



GLYCERIA. (1) A magnified spikelet of G. nervata; (2) a separate flower 

 with one joint of the rhachis; and (3) the lower half of a flowering 

 glume, showing its form (rounded on the back, not keeled). 



DISTICHLIS. (1) A pistillate spikelet of I), maritima, enlarged; (2) a 

 flower from the same ; and (3) a flower from a staminate spikelet. 



POA. (1) Panicle of P. compressa, reduced in size; (2) a magnified spike- 

 let ; (3) a separate flower more magnified ; (4) a flowering glume cut 

 across and somewhat outspread. 



ERAGROSTIS. (1) A spikelet of E. pilosa, enlarged; (2) the same, from 

 which the glumes and all of six lower flowers except the palets have 

 fallen away ; (3) a magnified flower, open ; (4) the flowering glume of the 

 same outspread. 



BRIZA. (1) A spikelet of B. media, enlarged; (2) a separate flower. 



FESTUCA. (1) A spikelet of F. elatior, enlarged; (2) a separate flower; 



(3 ) lower part of a flowering glume, outspread. 



BROMUS. (1) A spikelet of B. secalinus, or Chess; and (2) a separate 

 flower, enlarged. 



