112 Atavism. 
further examples. They are taken mainly from woody 
plants because herbaceous and especially annual plants, 
with the exception of the 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 
atropurpiirca of Corylus Avellana, C. tiibulosa, Betula 
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. 1 BRAUN 
mentions an example of Kerria japonica plena which pro- 
duced some branches with single flowers. 2 On a garden 
Hortensia 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. 3 
Trees with laciniate leaves habitually give rise to re- 
versions on solitary branches, as for instance Fagus syl- 
vatica aspleniifolia, Carpinus Betulns hetcrophylla, Sam- 
bucus nigra laciniata, Cytisus Laburnum quercifolia, Vitis 
and others. (BRAUN, loc. cit.) The same is true of 
Sali.r 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, Bot. Zeitung, 1881, p. 395; DARWIN, loc. cit., I, pp. 476- 
530; HOFMEISTER, Allgemcine Morphologic, p. 560, etc. 
1 FR. MULLER, Flora, Vol. 84, 1897, pp. 96-99. 
*Abh. d. k. Akad. Berlin, 1859, p. 219. 
3 Abh. d. Naturf. Vere'ms Bremen, Vol. 14, 1897, p. 276. 
