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- 

 p 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- 



FIG. 33. Leaves of barberry developing as thorns. 



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, 



