EXPLANATION OF PLATE II. 



HEMICARPHA. (1) Plant of H. subsquarrosa, natural size; (2) a spike- 

 let enlarged, with its bract ; (3) magnified scale of the same ; (5) a flower, 

 with its single stamen and minute internal scale, magnified; (6) achene, 

 magnified. 



LIPOCARPHA. (1) Upper part of plants of L. maculata, with spikelets; 

 (2) diagram of a flower, representing the ovary between the two internal 

 scales, a single stamen, the scale of the spikelet on one side, and the axis 

 of the spikelet on the other; (3) scale of spikelet detached; (4) a flower 

 with its two inner scales ; (5) achene, magnified. 



FUIRENA. (1) Upper portion of plant of F. squarrosa, var. pumila; 

 (2) scale of spike enclosing a flower ; (3) open scale of same ; (4) flower ; 

 (5) one of the scales and one of the bristles of the perianth; (6) achene, 

 and (7) section of same. 



