EXPLANATION OF PLATE VTTL 



POLYPOGON. — (1) Spike-like contracted pauicle of P. Monspeliensis ; 

 (2) an enlarged detached si^ikelet, showing the long aAvns to the empty 

 glumes; (3) the same open in flower; and (4) a separate flower without 

 tlie empty glumes. 



CINNA. — (1) A magnified spikelet of C. arundinacea; and (2) the same 

 open, displaying the flo\Aeriug glume and palet, the single stamen, and 

 the pistil. 



MUHLENBERGIxV. — (1) A magnified closed spikelet of M. sylvatica ; 

 (2) the same with the open flower raised out of the empty glumes. — (3) A 

 magnified spikelet of M. dilfusa; (4) its minute and uneipial empty glumes 

 more magnified; and (5) an open spikelet of the same. 



BKACHYELYTHUM.— (1) A spikelet of B. aristatum enlarged; (2) the 

 same displayed. 



CALAMAGKOiSTIS. — (1) An open spikelet of C. Cana.lensis, enlarged, 

 displaying all tlie parts; (2) the same with the floAver raised out of the 

 empty glumes, showing tlie hairy rudiment behind the palet.- 



ORYZOPiSlS. — (1) An open magnified spikelet of O. asperifolia; and (2) the 

 flower of the same removed from the empty glumes. Notice the remark- 

 ably long s(piamul£e or hypogynous scales, Avhich here nearly equal the 

 glume in length. 



STIPA. — Empty glumes and flower (a little separated) of S. avenacea, 

 enlarged. 



AKISTIDA. — A spikelet c^f A. purpurascens, enlarged. 



