EXPLANATION OF THE PLATES. 



MELICA. A magnified spikelet of M. mutica, expanded, showing the glumes, two perfect 



flowers, and an abortive one. 

 GLYCERIA. A magnified spikelet of G. nervata (1) 5 a separate flower with one joint of the 



rhachis (2) ; and (3) the lower half of a lower palea, showing its form (rounded on the 



back, not keeled.) 

 BRIZOPYRUM. A pistillate spikelet of B. spicatum, enlarged (1) ; a flower from the same (2) ; 



and a flower from a staminate spikelet (3). 

 POA. Panicle of P. compressa, reduced in size (1) ; a magnified spikelet (2) 5 a separate 



flower more magnified (3) ; a lower palea cut across and somewhat outspread (4). 

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



all of six lower flowers except the upper palea have fallen away (2) ; a magnified flower, 



open (3) ; the lower palea of the same outspread (4). 

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

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



lower palea, outspread (3). 

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



TAB. V. 



tNIOLA. A spikelet of U. latifolia, of about the natural size (1) ; a flower, enlarged (2) j 

 empty lower palea of the lowest (sterile) flower (3). 



PHRAGMITES. A spikelet of P. communis, enlarged (1) ; one of the perfect flowers, en- 

 larged (2) 5 and the lowest flower (3), which has stamens only. 



ARUNDINARIA. A spikelet of A. macrosperma (1) ; a separate flower, magnified (2). 

 LEPTURUS. Portion of the spike of L. paniculatus, enlarged (1) , a flower magnified (2). 

 LOLIUM. Portion of the spike of L. temulentum (1) ; a separate flower, magnified (2). 



TRITICUM. Portion of the spike of T. repens, or Couch-Grass, of about the natural size (1) ; 

 a flower magnified (2). 



HORDEUM. The three one-flowered spikelets from one joint of the spike of H. jubatum, 

 with their awn-like glumes, the lateral flowers abortive and neutral, the middle one alone 

 perfect (1) 5 this perfect flower (with an awn-like rudiment) open and enlarged (2). 



ELYMUS. The two spikelets of one joint of the spike of E. Virginicus, about the natural 

 size (1) ; the glumes and the flowers of one spikelet, enlarged and displayed (2) ; and 

 an open flower, more magnified (3). 



GYMNOSTICIIUM. A spikelet of G. Hystrix (1), and an expanded flower, magnified (2). 



TAB. VI. 



AIR A. Panicle of A. flexuosa (1) ; a spikelet, magnified, the parts displayed (2) ; and one 

 of the flowers detached and open (3). 



DANTIIONIA. Panicle of D. spicata (1) 5 a spikelet enlarged (2); and a separate flower 

 from the same (3). 



TRISETUM. A spikelet of T. subspicatum, var. molle, expanded and magnified (1) ; and a 

 separate open flower (2). 



AYENA. A spikelet of A. striata displayed and magnified (1) ; and a separate flower (2). 





