UNIVERSITY OF CALIFORNIA PUBLICATIONS 



IN 



BOTANY 



Vol. 7, No. 4, pp. 69-100, plates 1 1-17 January 17, 1917 



NOTES ON THE CALIFOENIAX SPECIES OF 



TRILLIUM L. 



IV— TERATOLOGIC AL VARIATIONS OF TRILLIUM SESSILE 



VAR. GIGANTEUM H. & A. 



BY 

 THOMAS HAEPER GOODSPEED 



The genus Trillium has long been recognized as unusually prone 

 to the production of teratological forms, and the occurrence of such 

 abnormalities has from time to time been noted for practically all the 

 more common and well-defined species. It is the purpose of the 

 present note to gather together a number of the references to tera- 

 tology in the genus, and particularly to describe the nature of a 

 number of abnormal forms found in the Californian representative 

 of T. sessile L. 



A rather thorough examination of the available literature has re- 

 sulted in the accumulation of a considerable number of references to 

 Trillium teratology. Since a compilation of the literature on the 

 subject has not, to my knowledge, been attempted, and especially since 

 many observers have published accounts of abnormalities apparently 

 without knowing that similar specimens have a number of times been 

 described elsewhere, it has seemed best to bring together certain of 

 the somewhat scattered references and to arrange them under the 

 species to which they severally refer. No claim is made for the 

 completeness of the list submitted below, since often in the older liter- 

 ature only the briefest notices are given to teratological phenomena. 

 It seems probable, however, that most of the more important contri- 

 butions have been examined. 



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