PKBFACE TO THE REPRINT OF 1884. 



The text of the second edition has been left un- 

 touched, and I have merely given an account (which 

 does hot pretend to be complete) of the progress of 

 the subject since 1880. 



Hetebostvled Plants, 



C. E. Bessey (' Amerioah Naturalist,' June, 1880, 

 p. 417) made careful measurements of the corolla, 

 Stamens, and style in a number of flowers of Litho- 

 Spermum lorigiflorvm. He shows that the length of 

 corolla, and especially the length of the style, is very 

 variable. An appearance of dimorphism is thus pro- 

 duced; but measurements of the pollen show that 

 there is no real heterostylism. 



C. B. Clarke (' Journ. Linn. Soc' xvii., p. 159) has 

 made the curious observation that in Adenosacme 

 lofigifolia, the differencie between the long- and 

 short-styled forfns amounts to what would usually 

 be called a character of first-rate systematic im- 

 portance. In the shbrt-styled flowers, the stamens are 

 on the corolla ; in the Ibng-styled, they are at its very 

 base, almost free from, it. In this form the corolla 

 separates and leaves the stamens Standing on the ovary. 



