112 Atavism. 



further examples. They are taken mainly from woody 

 plants because herbaceous and especially annual plants, 

 with the exception of tlTe instances named and of hybrids, 

 very seldom exhibit bud-variations. 



Green branches on red-leaved bushes and trees are 

 not rare and are for instance often seen in the variety 

 atropurpurca of Corylus Avellana, C. tubulosa, Bcttda 

 alba, and in the copper beech. The red bananas with their 

 red fruits have given rise to a green variety with yellow 

 fruit in spite of the fact that they are sterile.^ Braun 

 mentions an example of Kerria japonica plena which pro- 

 duced some branches with single flowers.^ On a garden 

 Hortcnsia producing only large sterile flowers, Focke 

 observed a branch bearing inflorescences with little fertile 

 flowers in the middle of a circle of large ornamental ones 

 as in the wild form.^ 



Trees with laciniate leaves habitually give rise to re- 

 versions on solitary branches, as for instance Fagus syU 

 vatica aspleniifolia, Carpinus Bctulns heterophylla, Sam- 

 bncus nigra laciniata, Cytisiis Laburnum quercifolia, Vitis 

 and others. (Braun, loc. cif.) The same is true of 

 Salix babylonica crispa, of the parsley grape, of nec- 

 tarines, and especially of roses and bulbs {Hyacinthus, 

 Gladiolus, etc.) although the possibility of previous crosses 

 makes the latter cases still doubtful. 



In conclusion, this list shows that the series of cases 

 which are amenable to experimental study is by no means 

 small. On the other hand the number of examples is 

 sufficient to demonstrate the pretty general occurrence 



Hoffmann, Bof. Zeihmg, iScSi, p. 395; Darwin, loc. cit., I, pp. 476- 

 530; HoFMEisTER, Allgemeiue Morphologie, p. 560, etc. 



^ Fr. MiJLLER, Flora, Vol. 84, 1897, pp. 96-99. 



^ Abh. d. k. Akad. Berlin, 1859, p. 219. 



^ Abh. d. Nafitrf. Vereins Bremen, Vol. 14, 1897, p. 276. 



