210 Class XXI. Order IH. 



Class XXI. MONCECIA. Staminiferous 



and pistiliferous, or barren and fertile flowers 

 on the same plant. 



Order II. DMNDRM. Two stamens. 



248. LEMNA. Calyx one leafed ; corolla none; 

 iftyle one ; capsule many seeded. 



Order III. TRIANDRM. Three stamens. 



217- ERIOCAULON. General calyx an imbri- 

 cate head ; corollas three petalled ; seed one, 

 crowned with the corolla. 



S48. CAREX. Spike imbricate ; calyx glume 

 one valved ; corolla none ; stigmas two or three ; 

 seeds covered with a swelling tunic. 



. SPARGANIXJM. Ament roundish ; calyx 

 three leaved ; corolla none ; stigma cloven ; drupe 

 dry, one seeded. 



S50. TYPHA. Ament of barren flowers cylin- 

 drical, hairy ; anthers about three on each filament. 

 Ament of fertile flowers cylindrical ; seed one, on 

 a feathery pedicel. 



251. COMPTONIA. Aments imbricated; in the 

 barren flowers, calyx two leaved ; corolla none ; 

 anther two parted. In the fertile flowers, calyx six 

 leaved; corolla none ; styles two; nut ovate. ' 



