EXPLANATION OF THE PLATES. 733 



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) ; 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) ; 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. 



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

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



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

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

 an open flower, more magnified (3). 



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



Tab. VI. 



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

 of the flowers detached and open (3). 



DANTHONIA. — Panicle of D. spicata (1); 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). 



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



