EXPLANATION OF PLATE XV. 



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



(2) a spike, enlarged ; (.'{) a spikelet, and (4) the same opened; (5) the 

 flower. 



KKKK'IILOA. (1) Inflorescence of E. polystaehya, reduced ; (2) a spikelet. 

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



R(.)TTI5<KI,LIA. (1) Portion of the spike of K. rngvsa, somev.-hat reduced, 

 and (2) a portion enlarge. 1, -with (-'5) the fertile spikelet and (4) the pedi- 

 celled sterile sjiikelet of the middle joint displaced ; ('>) the fertile spikelet 

 opened; (0) the third empty glume, ami (7) the rlmver. 



AMM< '1'IIILA. (1) Innoi'escenei! of A. aruiidinaeea. reduced ; (L ; ) a spike- 

 let, enlarged, and (.'!) the flower, with a hairy rudiment at the l>ase of the 

 palet. 



LEPTOCIIL* A. (!) Infloresceiice of L. mucrouata, reduced; (-2) portion 

 of rhaidiis <d' a spike, bearing two spikelets ; (:j) a .'3-flowei-ed spikelet ; and 

 (4) a flower removed. 



IH'CIILOK. (1) Staminate and (2) pistillate inflorescence of 15. dactyloides ; 



(3) a staminate spikelet, and (4) one of its flowers removed; (.">) a pistil 

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

 empty glume removed. 



Mrxi;<>.\. (1) Inflorescence of M. squarrosa ; (2) a spikelet, enlarged ; and 



(.'!) a flower, opened. 

 SCOLOCIILOA. (1) Inflorescence of S. festucacea, reduced; (L') a spikelet, 



enlarged ; and (.'!) a flower. 

 PUCCINELLTA. (1) Inflorescence of I', maritima, reduced; (2) a spikelet, 



enlarged; and (!) a flower. 



