VI PEEFACB TO THE EEPEINT 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. 



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

 shows that Macrotomia is dimorphic like Amebia. 

 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 Macrotomia as having sjpecimina longistyla and 



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

 believes that the ancestor of the heterostyled Primulse 

 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 onto- 

 genesis of the flowers. This opinion has been ad- 

 versely criticised by W. Behrens (' Botanisches Central- 

 blatt,' 1880, p. 1082) and by Hermann MuUer ('Bot. 

 Zeitung,' 1880, p. 733). 



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

 shows by measurement and experiment that Meloehia 

 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 stamens 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 

 dimorphic. 



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



