DOT AN y FOR YOUNG PEOPLE. 167 



male: Involucre, two leaved. Corol none, 

 Drupe dry, muricated, two cleft. Nut two 

 celled. 



X. Strumarium. Stem unarmed. Leaves 

 cordate, serrate, three nered at the base. Fruit, 

 oval, pubescent, with hooked bristles. [Bur 

 Weed.] 



YUCCA. Hexandria Monogynia. Corol, in- 

 ferior, bell form. Filaments sub-clavate. Style, 

 none. Capsule oblong, with three obtuse 

 angles, three celled opening at the summit. Seeds 

 compressed. 



Y. Filamentosa. Stemless. Leaves broad, 

 lanceolate entire, filamentose in the margin. 

 Stigmas turned back, spreading. [Silk Grass. 

 Bear Grass.] 



ZEA. Mono3cia Triandria. Male : Calyx, 

 glume, two flowered, awnless, corol glume, 

 awnless. Female : Calyx glume, two valved. 

 Style one, long and pendulous. Seed solitary, 

 buried in an oblong receptacle. 



[In examining this genus it should be re- 

 membered that the number of valves are in- 

 creased in the glumes by cultivation.] 



