226 Obscri'ation of the Origin of Varieties. 



Lamium maeiilatiiin and Galeohdolon lutciim commonly 

 produce peloric flowers in the neighborhood of Vienna. 

 They often bear them every year on the same plant, but 

 one or more years are sometimes skipped. A sunny 

 position increases the number of anomalous flowers whilst 

 dense shade diminishes it ; consequently one locality often 

 furnishes instances of peloria in several species of Lab- 

 iates (e. g., Calaiiiintha and others), whilst the same 

 species growing together in another locality will not pro- 

 duce a sinerle svmmetrical flower or onlv verv few. When- 

 ever the conditions affecting a plant were improved by 

 cutting down timl)er, peloria occurred in profusion, and 

 the transference of a plant to a sunny spot in a garden 

 often resulted in its appearance. Other authors, and 

 particularly Vuillemin/ also assert that the conditions 

 of life play an important part in inducing the anomaly, 

 provided that the inherited potentiality for it is present. 



hildiingen, Denkschr. d. k. Akad., Vienna, Vol. XXXVIII, Part TI, 

 1877, with Plates I-VIII. See also Goebel, Organographie, I, p. 163. 



^ Loc. cit., 1894, p. 33. 



