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Stamens adherent to the corolla tube for a part of the distance 

 then leading inwards, thus effectually excluding bees from 

 the honey so that only Sphingidae can obtain it. Mr. 

 Robertson reports that honey bees remove the pollen as soon 

 as the flower is open, before the flight of Deilephila lineata. 

 A Venezuelan species of Datura is visited by Docimastes en- 

 sifer, the female of which has a beak 8 cm- long, and the 

 male one 10 cm. in length, these corresponding to the tube 

 of the corolla. 



Nicotiana alata. This commonly cultivated plant is 

 clammy pubescent with a large white corolla, a long and 

 nearly cylindrical tube, 5-6 cm. long, with a limb deeply 

 five cleft. The stamens are inserted on the tube and includ- 

 ed; the stigma partially blocks the passage way. The flow- 

 ers are open during the night and are delightfully fragrant. 

 Here at Ames it is abundantly visited by Sphingidae. 



Schizanthus pinnatus. This plant is now commonly cul- 

 tivated in gardens. Its flowers are irregular, two-lipped. 

 The upper lip is made up of five parts, variously colored and 

 spotted with yellow and purple, a narrow groove leads to the 

 nectar. The under lobe of the smaller lip is more or less 

 hooded and sack-like. When the insect settles upon the low- 

 er lip it springs up and the pollen is thrown out for a consid- 

 erable distance. The stamens are held in the tube of the 

 lower lip. 



SchroptHlariaceae. '^^^ members of this order show var- 

 ious adaptations to insect visitors. 

 Some of the species have corollas regular or nearly so, as in 

 Veronica. These are adapted to flies and bees. Secondly in 

 Scrophularia, the flowers are dull in color with a wide open 

 mouth and nectar easily accessible and Antirrhinum and 

 Linaria with the nectar protected, pollinated by large bees. 



