328 Nutrition and Selection. 



numerous bifoliate ones. Pimis Pinaster exhibits the 

 same phenomenon. In different years the frequency of 

 its occurrence varies greatly. 



Camellia japonica with striped flowers, is striped 

 mainly in November and December; but if it flowers 

 in April, it produces only self-colored ones.-^ A form 

 of Trifoliiuii repcns produced pitchers in my garden al- 

 most every year in no inconsiderable numbers and in 

 great variety of forms. But they never occurred except 

 in the spring;- just as the lime bears its pitchers chiefly 

 on the first leaves of the branches and Saxifraga crassi- 

 folia on the lower abbreviated and leafy part of the 

 flower peduncle.^ Ulniiis caiiipestris, on the other hand, 

 forms its pitchers chiefly from the strongest leaves in the 

 middle and upper part of the branches. 



It is in this middle region of the branches that anom- 

 alies are most commonly found, either exclusively or 

 chiefly. Thus Fritz Muller describes a Begonia from 

 Brazil, of the height of a man, which bore little append- 

 ages at the base of the leaf blade, ^ which were usually not 

 more than 1-3, and sometimes from 5-50 mm. long. 

 Thev were onlv found on the fourth to the tenth leaf, in 

 one case from the second to the fifth leaf, of the upright 

 stem ; and occurred at the same height on every anom- 

 alous stem, both in the garden and in the field. 



In May 1890 I observed a group of Epilobium hir- 

 sutiiin, the numerous and still young stems of which 

 were for the most part forked. These divisions occurred 

 always about the same height and did not recur during 



^Verlot, loc. fit., p. 67. 



J. C. CosTE'^us, Bekertjes aan de eindhlaadjes van Trifolium 

 repens. Botan. Jaarboek, Gent, 1892, p. 13, PI. I. 



^T. Tammes, Kon. Akad. d. Wetensch., Amsterdam, 1903. 



* Fr. Muller, Ber. d. d. Ges., Vol. V, p. 44. 



