330 Class XXI. Order IV. 



Order III. TRMNDRM. Three stamens. 



393. ERIOCAULON. General calyx an imbricate 

 head ; corollas three petalled ; seed one, crowned with 

 the corolla. 



394. CAREX. Spike imbricate ; calyx glume one 

 valved ; corolla none ; stigmas two or three ; seeds 

 covered with a swelling tunic. 



395. SPARGANIUM. Ament roundish ; calyx three 

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

 seeded. 



396. TYPHA. Ament of barren flowers cylindrical, 

 hairy ; anthers about three on each filament. Ament 

 of fertile flowers cylindrical ; seed one, on a feathery 

 pedicel. 



397. 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. 



Order IV. TETRANDRIJ1. Four stamens. 



398. URTICA. Barren flowers, calyx four leaved ; 

 corolla none ; nectary central, cup shaped. Fertile 

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

 superior, shining. 



399. BCEHMERIA. Barren flowers, calyx four part- 

 ed ; corolla none. Fertile flowers, calyx of crowded 

 scales with no corolla, and a germ between each scale ; 

 style one ; seed one, compressed. 



400. ALNUS. Barren flowers, ament composed of 

 wedge shaped, three flowered receptacles ; corolla four 

 parted. Fertile flowers, scales of the ament two flow- 

 ered ; corolla none ; styles two ; seed compressed, 

 ovate. 



