196 MONCECIA MONANDEIA. 



ments, 2 or 3-flowered, inner superior, 5 or 6. cleft; corolla 

 none ; styles 5 or 6 nuts 2 or 3, loosely invested with the 

 spreading outer calyx. 



274. QUERCUS. BARREN FLOWER in a catkin; calyx in several 

 segments ; corolla none ; stamens 8, or more. FERTILE 

 FLOWER calyx double, outer inferior, scaly, undivided, 

 inner superior, in 6 deep segments ; corolla none ; style 1 ; 

 nut solitary, closely invested at its base with the hemis- 

 pherical outer calyx. 



277. CORYLUS. BARREN FLOWER in a catkin; calyx a 3-cleft 

 scale ; corolla none ; stamens 8, or more. FERTILE 

 FLOWER calyx double, outer inferior, divided, inner supe- 

 rior, obsolete ; corolla none ; styles 2 ; nut solitary, bony, 

 invested with the enlarged coriaceous jagged outer calyx. 



276. BETULA. BARREN FLOWER in a catkin; calyx a ternate 

 scale; corolla none; stamens 10-12. FERTILE FLOWER 

 in a catkin ; calyx a peltate, 3-lobed, 3-flowered scale ; co- 

 rolla none ; styles 2 ; nut winged, deciduous. 



272. ARUM. Common calyx a sheathing leaf inclosing a common 

 stalk naked above ; corolla none. BARREN FLOWER sta- 

 mens numerous, in a dense ring, surmounted by another 

 ring of abortive filaments. FERTILE FLOWER germenn 

 numerous, in a dense ring below the stamens, sessile; 

 styles none ; stigmas downy ; berry with several seeds. 



I. MONANDRIA. 

 263. EUPHORBIA. 



1. E. Peplus, umbel 3-branched, forked ; bracteas ovate ; leaves 

 obovate, stalked, entire ; nectaries crescent-shaped ; seeds dot- 

 ted. Petty Spurge. 



Hob. Cultivated grounds. July, Aug. Q 



