MONCECIA. 195 



267- CAREX. BARREN FLOWER catkin imbricated ; calyx a 

 scale; corolla none. FERTILE FLOWER catkin imbrica- 

 ted ; calyx a scale ; corolla a hollow permanent glume, in- 

 vesting the loose seed. (Grass-like.) 



265. TYPHA. BARREN FLOWER catkin hairy ; calyx none ; co- 

 rolla none ; anthers about 3 on each filament. FERTILE 

 FLOWER catkin hairy ; seed \ 3 on a hairy stalk. (Reed- 

 like.) 



III. TETRANDRIA. 



268. LITTORELLA. BARREN FLOWER calyx 4-leaved ; corolla 



4-cleft ; stamens capillary > very long. FERTILE FLOWER 

 calyx none ; corolla unequally 3 or 4-cleft ; style very 

 long ; nut of 1 cell. 



270, URTICA. BARREN FLOWER calyx 4-leaved ; petals none ; 

 nectary central, cup-shaped ; stamens the length of the 

 calyx. FERTILE FLOWER calyx 2-leaved ; corolla none; 

 seed I, superior, polished. 



269. ALNUS. BARREN FLOWER calyx scale of a catkin, perma- 



nent, 3-flowered ; corolla deeply 4-cleft. FERTILE FLOWER 

 calyx scale of a catkin^ permanent, 2-flowered; corolla 

 none ; styles 2 ; nut compressed, without wings. 



IV. POLYANDRIA. 



271' MYRIOPHYLLUM. BARREN FLOWER- calyx 4-leaved ; pe- 

 tals 4 ; stamens 8. FERTILE FLOWER calyx 4-leaved ; 

 petals 4 ; stigmas 4, sessile ; drupas 4. (Aquatic.) 



273. POTERIUM. BARREN FLOWER calyx 3-leaved ; corolla 

 deeply 4-cleft ; stamens 30-50. FERTILE FLOWER calyx 

 3-leaved ; corolla deeply 4-cleft ; pistils 1 or 2 ; nut coated, 

 of 1 or 2 cells. 



2T5. FAGUS. BARREN FLOWER in a catkin ; calyx in several 

 segments ; corolla none ; stamens 5-20. FERTILE FLOWER 

 calyx double, outer inferior, prickly, in several deep seg- 



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