36 



A TEXT-BOOK OF BOTANY 



bog plant (Fig. 34), but is not so elaborately constructed 

 for capturing insects as is a common southern Sarra- 

 cenia (Fig. 35). In this plant the leaves are slender, hol- 

 low cones, and rise in a tuft from the swampy ground. 

 The mouth of this conical urn is overarched and shaded by 

 a hood, in which are translucent spots, like numerous small 

 windows. Around the mouth of the urn are glands which 



secrete a sweet liq- 



^ _._.. j uid, known as nectar. 



Inside, just below 

 the rim of the urn, 

 is a glazed zone, so 

 smooth that insects 

 cannot walk upon 

 it. Below the glazed 

 zone is another one 

 thickly set with stiff, 

 downward-pointing 

 hairs; and below this 

 is the liquid in the 

 bottom of the urn. 

 If a fly, attracted to 

 the nectar at the rim 

 of the urn, attempts 

 to descend within the 

 urn, it slips on the 

 glazed zone and falls 

 into the water; and 

 if it attempts to 

 escape by crawling, 

 the downward-point- 

 ing hairs prevent. If 

 it seeks to fly from the rim, it naturally flies toward the 

 translucent spots in the hood, since the direction of en- 

 trance is in the shadow; and pounding against the hood, 



FIG. 33. Leaves of barberry developing as thorns. 



