yi PREFACE TO THE REPRINT OF 1884. 



He also describes two forms of Bandia uliginosa, 

 (i.) having large sessile flowers with separate stigmas 

 and producing a large fruit; (ii.) small pedunculated 

 flowers with clavate stigmas, and producing smaller 



fruit. 



C. B. Clarke (' Journ. Linn. Soc.,' xviii. p. 524) 



shows that Macrotomia is dimorphic like Arnebia. Mr. 

 Clarke mentions as one of the earliest good notices of 

 heterostylism that Fischer and Meyer (' Enum. PI. 

 Schrenk.,' p. 34, published in 1841) speak of Macro- 

 tomia as having specimina longistyla and brevistyla. 



Breitenbach ('Botanische Zeitung,' 1880, p. 577) 

 believes that the ancestor of the heterostvled Primula? 



v 



was homostyled. He grounds his belief on the ex- 

 amination of a large number of plants of P. elatior, 

 Jacq., and on some facts connected with the ontogene- 

 sis of the flowers. This opinion has been adversely 

 criticised by W. Behrens (' Botanisches Centralblatt,' 

 1880, p. 1082) and by Hermann Miiller (< Bot. Zeitung,' 



1880, p. 733). 



A. Ernst (Caracas) ('Nature/ xxi., 1880, p. 217) 

 shows by measurement and experiment that Melochia 

 parviflora is heterostyled (dimorphic). 



According to J. Todd (' American Naturalist/ xv., 



1881, p. 997), Black mustard (B. nigra) has two forms 

 of flower, differing in the length of the pistil; the sta- 

 mens being of approximately the same length in the 

 two forms. 



Trelease (' American Naturalist,' xvi., 1882, p. 13) 

 describes two forms of Oxalis violacea, which appear 

 to be long- and short-styled forms of a trimorphic 

 species. No mid-styled flowers could be found, and 

 Trelease is inclined to believe that the species is di- 

 morphic. 



Ig. Urban (' Sitz. Bot. Verein, Prov. Brandenburg,' 



