EXPLAN-ATIOX OF PLATE XIL 



DESCHAMPSIA. — (1) Panicle of D. flexuosa ; (2) a spikelet, magnified, the 

 parts displayed; and (3) one of the flowers detached and open. 



DAJfsTHONIA. — (1) Panicle of D. spicata; (2) a spikelet enlarged; and 

 (3) a separate flower from the same. 



TRISETUM. — (1) A spikelet of T. subspicatum, var. molle, expanded and 

 magnified; and (2) a separate open flower. 



AVENA. — (1) A spikelet of A. striata, displayed and magnified; and (2) a 

 separate flower. 



ARRHEXATHERUM. — A spikelet of A. avenaceum, displayed and mag- 

 nified; (1) the empty glumes; (2) the flowers, the lower one staminate 

 only, the next perfect, and the third a rudiment. 



HOLCUS. — (1) A spikelet of H. lanatus, magnified ; (2) the same displayed 

 to show the two flowers, the lower perfect and awnless, the upper stami 

 nate and awned. 



