16 University of California Publications in Bohnni [Vol. 7 



eases lo lie i-cprodueed year after year from llic same rootstock, as 

 does tlie peculiai- altiioniialil y which consists of the production of 

 small 1mi1 fully ilcvrloiicd pistils witliiii tlir ])lacentation of the legiti- 

 iiialc ovary. Two cases of |)istillo(ly of the j)erianth, a case in which 

 sepals are reduced to scales, and many cases of pctalody of sepals 

 and stamens and duplication of parts have been noted in the field 

 and the rootstoclcs bi-ouprht under observation in the garden. 



SUMMARY 



Following a description of the Calif ornian species of Trillium — 

 T. scssilf vai'. (jigantcum, T. ovatum and T. nivale — the following 

 points wci-c bi'ouii'ht uj) and discussed more or less in detail. They 

 represent llic i-esults of field and garden studies and in many cases 

 have been mentioned in this first pai)er of the contemplated series 

 dealing with the Californian species of Trillium, simply as prelim- 

 inary statements of important problems which are being separately 

 attacked in considerable detail. 



1. The extent of the size differences between the eastern T. sessile 

 L. and its Californian variety giganteum H. & A. 



2. The wide range of variation in flower color characteristic of 

 the Californian variety of 2\ sessile. 



3. The occurrence of a pure white, a yellow-green and a heavily 

 l^igmented color form and a definition of their range of distribution. 



4. The high degree of sterility exhibited by the Californian T. 

 sessile and the lack of any appreciable degree of sterility in T. 

 ovatum. 



5. The importance of asexual reproduction in T. sessile var. 

 giganteum and the almost entire absence of the same in T. ovatum. 



6. The yearly recurrence or lack of recurrence of teratological 

 variations in T. srssile var. giganteum. 



Transmitted April 6, 1916. 



