1917] Goodspeed : Notes on Trillium 85 



SUMMARY 



1. An effort has been made to tabulate the more important refer- 

 ences in the literature to teratological variations found in the following 

 species of Trillium: grandifloriim, erectum, sessile, luidulatum, 

 cernimm, nivale, recurvatum, ovatum, and sessile var. giganteum. 



2. Seventeen teratological variations of T. sessile var. giganteum 

 are described. 



3. Evidence is given to show that such relatively superficial vari- 

 ations as the change from the trimerous to the tetramerous condition 

 do not recur in succeeding years from the same rootstock, while more 

 profound structural variations may so recur. 



4. It is suggested that the origin of such recurring teratological 

 variations may be due to the heterozygous condition of an original 

 parent plant. 



Transmitted September 8, 1916. 



