Chap. III. 



PULMONAEIA ANGTTSTIFOLIA. 



105 



conformity with other important functional differences 

 between them, immediately to be described. 



The long-styled and short-styled flowers of P. angus- 

 tifolia differ from one another in structure in nearly 

 the same manner as those of P. offiaainalis. But in the 

 accompanying figure a slight bulging of the corolla 



Fig. 6. 



Long-styled form. Shoi't-styled form. 



PULMONABIA ANGUSTIPOLIA. 



in the long-styled form, where the anthers are seated, 

 has been overlooked. My son William, who examined 

 a large number of wild plants in the Isle of Wight, 

 observed that the corolla, though variable in size, was 

 generally larger in the long-styled flowers than in the 

 short-styled ; and certainly the largest corollas of all 

 were found on the long-styled plants, and the smallest 

 on the short-styled. Exactly the reverse occurs, ac- 

 cording to Hildebrand, with P. officinalis. Both the 

 pistils and stamens of P. angustifolia vary much in 

 length ; so that in the short-styled form the distance 

 between the stigma and the anthers varied from 119 

 to 65 divisions of the micrometer, and in the long- 

 styled from 116 to 112. From an average of seven 



