EXPLANATION OF PLATE X. 



TRI< )DIA. (1) Magnified spikelet of T. seslerioides ; (2) the same displayed 

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

 out. 



GRAPHEPHORrM. (1) A magnified spikelet of <i. melieoides, displayed ; 



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

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



in its glume and pulet. 



DACTYLIS. A spikeht <>[ 1). glomerata magnilied 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 ami keeled 

 in its natural condition. 



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

 empty glumes, the two flowers, and a rudiment. 



MELICA. A magnified spikelet of M. iiiutica, expanded, showing the empt \ 

 glumes, two perfect flowers, and an abortive one. 



GLYCEHIA. (1) A magnified spikelet of (i. 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 hack, not keeled). 



DISTIC11LIS. (1) A pistillate spikelet of D. maritima, enlarged; (2) a 

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



I'OA. (1) Panicle of P. compressa, reduced in si/,e ; (2) a magnified spike- 

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

 across and somewhat outspread. 



ERAGUOSTIS. (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. 



BKI/A. (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. 



HROMl'S. (1) A spikelet of B. secaliuus, or Chess; and (2) a separate 

 flower, enlarged. 



