EXPLANATION OF PLATE XT. 



rXIOLA. (1) A s] >ik<.-let of V. latifolia, of about the natural size; (2) a 

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



PI-IK AUMITES. (1) A spikelet of 1'. eommunis, enlarged; (2) one of the 

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

 only. 



Alvl'Nl )INA 1!IA. (1) A spikelet of A. uiacrospenna ; and (2) a separate 

 flower, magnified. 



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

 and (2) a flower, magnified. 



LOLIUM. (1) Portion of the spike of L. temulentmu; and (:?) a separate 

 flower, magnified. 



AGROI'YRI'M. (1) Portion of the spike of A. repens, or Couch-Grass, of 

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



HORPEVM. (1) The three one-flowered spikelets from one joint of the 

 spike of H. juhatum, with their awn-like empty glumes, the lateral flouers 

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

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



ELYMt'S. (1) The two spikelets of one joint of the spike of E. Virginicus, 

 about the natural size ; (2) the empty glumes and the flowers of one spike- 

 let, enlarged and displayed; and (3) an open flower, more magnified. 



GY.MXnSTICnrM. (1) A spikelet of G. Ilystrix; and (2) an expanded 

 flower, magnified. 



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

 magnified. 



