CLASS XXI. ORDER I. 353 



Order IT. DIANDRIA. Two stamens. 



369. Lemna. Calyx one leafed ; corolla none ; 

 style one ; capsule many seeded. 



Order III. TRIANDRIA. Three stamens. 



370. Eriocaulon. General calyx an imbricate 

 head ; corollas three petalled ; seed one, crowned 

 with the corolla. 



371. Carex. Spike imbricate ; calyx glume one 

 valved ; corolla none ; stigmas two or three ; seeds 

 covered with a swelling tunic. 



372. Sparganium. Ament roundish ; calyx three 

 leaved ; corolla none ; stigma cloven ; drupe dry, one 

 seeded. 



373. Typha. Ament of barren flowers cylindrical, 

 hairy ; anthers about three on each filament. Ament 

 of fertile flowers cylindrical ; seed one, on a feathery 

 pedicel. 



374. Comptonia. Aments imbricated ; in the bar- 

 ren flowers, calyx two leaved ; corolla none ; anther 

 two parted. In the fertile flowers, calyx six leaved ; 

 corolla none; styles two ; nut ovate. 



375. SiCYOs. Barren flowers, calyx five toothed, 

 corolla five petalled, anthers cohering. Fertile flowers, 

 calyx five toothed, corolla five parted, style 'three 

 cleft; fruit prickly, one seeded. 



Order l\. TETRANDRIA. Four stamens. 



376. Urtica. Barren flowers, calyx four leaved ; 

 corolla none; nectary central, cup shaped. Fertile 

 flowers, calyx two leaved; corolla none; seed one, 

 superior, shining. 



377. BcEHMERiA. Barren flowers, calyx four part- 



30=^ 



