EXPLAXATIOX OF PLATE XT. 



UNIOLA. — (1) A spikclet of V. latifolia, of about the natural size; (2) a 



Hower, enlarged ; (3) empty flowering glume of tlie lowest (sterile) flower. 

 VHKAGMITES. — (1) A spikelet of V. communis, enlarged; (2) one of the 



perfect ficjwers, enlarged ; and (3) the lowest flower, which has stamens 



only. 

 ARUNDIXAKIA. — (1) A si)ikelet of A. macrosperina; and (2) a separate 



flower, magnified. 

 SCIIEDONNARDUS. — (1) Portion of the spike of S. Texanus, enlarged ; 



and (2) a flower, magnified. 

 LOLIUM. — (1) Portion of the spike of L. temulentum ; and (2) a separate 



flower, magnified. 

 AGROPYllUM. — (1) Portion of the spike of A. repeiis, or Couch-Grass, of 



about the natural size ; (2) a flower, magnified. 

 HORDEUM. — (1) The three one-flowered spikelets from oue joint of the 



spike of H. jubatum, with their awn-like empty glumes, tlie lateral flowers 



abortive and neutral, the middle one alone perfect ; (2) this perfect flower 



(witli an awn-like rudiment) open and enlarged. 

 ELYJMU8. — (1) The two spikelets of one joint of the spike of E. Yirgiuicus, 



about the natural size ; (2) the empty glumes and tlie flowers of one s])ike- 



let, enlarged and disjdayed ; and (3) an open flower, nun-e magnified. 

 GYMNOSTICHUM. — (1)"a spikelet of G. Hystrix; and (2) an expanded 



flower, magnified. 

 ASPRELLA. — (1) A spikelet of A. Hystrix; and (2) an expanded flower, 



magnified. 



