450 Stout: The Origin of Dwarf Plants 



• 

 Vries, Hugo de. 



1901. Die Mutationstheorie. Vol. I. Leipzig. 



1904. Species and varieties. Their Origin^by[Mutation. Chicago. 



1909. The mutation theory. Vol. I. Translation by Farmer (J. 



B.) and Darbishire (A. D.) Chicago. 

 1913. Gruppenweise Artbildung unter spezieller Beriicksichti- 



gung der Gattung Oenothera. Berlin. 



Explanation of plates 26-27 



Plate 26. 



To the left, typical plant of the dwarf form of Hibiscus oculiroseus (Plant No. 

 14 of Series VIII). To right typical plant of the robust form (Plant No. 23 of 

 Series IX). Photograph taken September 13, 1914. Both plants are seven months 

 old. 



Plate 27. 



View in garden. In center with marker in the midst is a series (Series VIII) 

 of dwarf plants. Plant indicated at a is an intermediate. At the right is a series of 

 hybrids between H. oculiroseus (Plant O No. 2) and the pink-flowered type of H. 

 Moscheutos. To the left is part of a series of hybrids between white-flowered and 

 pink-flowered forms of H. Moscheutos. The three series are of the same age and 

 illustrate the difference between the dwarf and the robust forms. 



