Photo W IE. J. WaUit. 



Fia. 141. HYBRID PITCHER-PLANT (Nepenthes obrienana). 



The midrib continues beyond the apex of the blade, as a tendril, but also develops into a pitcher-shaped hollow with a 



distinct hd, which can be raised or lowered by the plant. The interior walls secrete a fluid, formerly supposed to 



be pure water, but now known to possess digestive powers. 



107 



