EXPLANATION OF PLATE XV. 



BECKMANNIA. (1) Inflorescence of B. erucseformis, var., reduced in size;, 



(2) a spike, enlarged; (3) a spikelet, and (4) the same opened; (5) the 

 flower. 



ERIOCHLOA. (1) Inflorescence of E. polystachya, reduced ; (2) a spikelet,, 

 enlarged, and (3) the same opened ; (4) the flower opened. 



ROTTBCELLIA. (1) Portion of the spike of R. rugosa, somewhat reduced, 

 and (2) a portion enlarged, with (3) the fertile spikelet and (4) the pedi- 

 celled sterile spikelet of the middle joint displaced ; (5) the fertile spikelet 

 opened ; (6) the third empty glume, and (7) the flower. 



AMMOPHILA. (1) Inflorescence of A. arundinacea, reduced; (2) a spike- 

 let, enlarged, and (3) the flower, with a hairy rudiment at the base of the 

 palet. 



LEPTOCHLOA. (1) Inflorescence of L. mucronata, reduced; (2) portion 

 of rhachis of a spike, bearing two spikelets ; (3) a 3-flowered spikelet ; and 

 (4) a flower removed. 



BUCHLOE. ( 1 ) Staminate and (2) pistillate inflorescence of B. dactyloides ; 



(3) a staminate spikelet, and (4) one of its flowers removed; (5) a pistil- 

 late spikelet, enlarged; (6) vertical section of same; and (7) the outer 

 empty glume removed. 



MUNROA. (1) Inflorescence of M. squarrosa; (2) a spikelet, enlarged; and 



(3) a flower, opened. 

 SCOLOCHLOA. (1) Inflorescence of S. festucacea, reduced ; (2) a spikelet, 



enlarged; and (3) a flower. 

 PUCCINELLIA. (1) Inflorescence of P. maritima, reduced; (2) a spikelet,. 



enlarged; and (3) a flower. 



