22 



KEY AND FLORA 



(The family is too difficult for the beginner, but the struc- 

 ture and grouping of the flowers may be gathered from a 

 careful study of Figs. 2, 3.) 



FIG. 4. Inflorescence, Flower, and Seed of a Sedge. 



(Great Bulrush, Scirpus lacustrls.) 



A, magnified flower, surrounded by a perianth of hypogynous bristles ; 

 seed ; C, section of the seed, showing the small embryo enclosed 

 base of the endosperm. 



B, the 

 in the 



CYPERA'CE^. SEDGE FAMILY 



Grass-like or rush-like herbs, with solid, usually triangular 

 steins, growing in tufts. The sheathing base of the generally 

 3-ranked leaves, when present, is not slit as in grasses. The 



