Pipe Vine; Dutchman’s Pipe ( Aristolochia macro - 
phylla). The Dutchman’s Pipe is chiefly a southern 
plant or vine, being found from Pa. and Minn, south¬ 
wards. It has a woody, climbing stem that may attain 
lengths of from 10 to 40 feet. The very large, deep 
green, veiny leaves that alternate along the stem are 
very beautiful. In the dull, greenish-yellow flowers, 
however, lies the chief interest of the botanist. Its 
stigma matures and withers away before the ripening 
of the pollen, thus making the plant dependent upon 
insects for its perpetuation. 
The throat is filled with tiny hairs, all pointing in¬ 
wards, so ingress is easy but egress impossible. Enter¬ 
ing insects are held prisoners, living upon the nectar, 
until the stigma withers and pollen ripens; after this 
the hairs in the throat lose their rigidity and the pollen- 
dusted and well fed prisoners are allowed to escape. 
Their memories are poor or the pollen feast is well 
worth the imprisonment, for they usually immediately 
)tie to another blossom and force their way in, of course 
pollenizing the flower in so doing. 
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