EXPLANATION OF PLATE XII. 



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

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



DANT1IONIA. (1) Panide of I), 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. 



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

 separate flower. 



ARRHENATIIERUM. 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 II. lanatus, magnified; (2) the same displayed 

 to show the two flowers, the lower perfect and awuless, the upper stami- 

 riate and awned. 



