EXPLANATION OF THE PLATES. 



Genera of Cyperaces3 or Sedges. 

 Tab. I. 



GYPERUS. — Small plant of C. diandras (1); a spike magnified (2); a piece of the 

 rhachia with one scale enclosing its flower (3); a separate flower more mag- 

 nified (4). C. erythrorhizos, a spike magnified, the lower scales and flowers 

 have fallen, showing the little internal scales of the section Papyrus (5), 

 formed of the winged margins of the joints of the rhachis detached ; a sepa- 

 rate one more enlarged (6); a flower (7); an achenium (8), cut in two. 

 C. dentatus, a piece of the rhachis of a spike with lower part of one scale, 

 showing how it is decurrent on the joint beneath (cut across) to form scale- 

 like wings (9). 



DULICHIUM. — Upper part of a plant (1); part of a spike somewhat enlarged (2); 

 piece of rhachis and one scale decurrent on the joint beneath (3); magnified 

 flower (4). 



KYLLIXGIA. — Plant of K. pumila (1); one-flowered spike on a piece of the rha- 

 chis, enlarged (2); the same more enlarged and open (3); achenium (4), and 

 section of same magnified (5). 



Tab. II. 



HEMICARPHA. — Plant (1), natural size; a spike enlarged, with its bract (2); 

 magnified scale of the same (3); a flower (5), with its single stamen and 

 minute internal scale, magnified; achenium (6), magnified. 



LIPOCARPHA. — Upper part of plants with spikes (1); diagram of a flower, viz. of 

 ovary between the two internal scales, and single stamen, scale of the spike on 

 one side, axis of the spike on the other (2); scale of spike detached (3); a 

 flower with its two inner scales (4); achenium magnified (5). 



FUIRENA. — Upper portion of plants (1); scale of spike enclosing a flower (2); 

 open scale of same (3); flower (4); one of the scales and one of the bristles 

 of the flower (5), achenium (6), and section of same (7). 



Tab. m. 



ELEOCHARIS.— Small plant of E. olivacea (1); the spike enlarged (2); detached 



scale (3); flower(4); achenium and bristles (5). E. quadrangulata, spike (6); 



a scale (7); flower (8); achenium and bristles (&). E. tuberculosa; the 



achenium with its great tubercle, and bristles (10). 

 SCIEPUS. — Summit of plant of small S. debilis (1); a spike (2); a scale of the 



same (3), and flower (4); achenium with its bristles (5). S. (Trichophorum) 



