EXPLAXATIOX OF PLATE XV. 



BECKMAXXIA. — (1) lufloresceuce of B. eruc£eforiiiis, var., reduced in sizej 



(2) a spike, eularged ; (3] a spikelet, aud (4) the same opened; (5) the 

 flower. 



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

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



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

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

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

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



AMMOPHILA. — (1) lufloresceuce of A. aruudinacea, reduced; (2) a spike- 

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

 palet. 



LEPTOCHLOA. — (1) lufloresceuce of L. mucrouata, reduced; (2) portion 

 of rhachis of a spike, bearing two spikelets ; (3) a 3-flo\vered spikelet ; and 

 (4) a flower removed. 



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



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

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

 empty glume removed. 



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



(3) a flower, opened. 

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



enlarged ; aud (3 ) a flower. 

 PUCCIXELLIA. — (1) Inflorescence of P. maritima, reduced; (2) a spikelet^ 



enlarged; and (3) a flower. 



