THE NUTRITION OF PLANTS 
scattered also over the inner surface of the blade. These 
glands excrete a clear, sticky fluid, which hangs to them in 
drops like dew-drops. If a small insect becomes entangled 
FIG. 157. Plants of Dioncea, showing the rosette habit of the leaves with terminal 
traps, and the erect flowering stem. After KEBNEK. 
in the sticky drop, the hair begins to curve inward, and 
presently presses its victim down upon the surface of the 
blade. In the case of larger insects, several of the marginal 
hairs may join together in holding it, or the whole blade 
may become more or less rolled inward. 
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