1916] LEVINE—CHLORANTHY IN DROSERA 307 
a winter bud. The degree of chloranthy is more developed than 
in the case described by PLANcHON, and appears also to be more 
constant, although abnormalities among the monstrosities occur. 
It appears from these cases that the degree of chloranthy may 
vary. It may be argued that a case like the one described in the 
present paper is less abnormal than the other cases mentioned. It 
appears that normal pollen may be formed, and under favorable 
conditions cross-pollination may take place between these forms 
and the normal species of Drosera; that is, sexual reproduction has 
not entirely disappeared. At the same time, these plants appear to 
be capable of propagating themselves vegetatively by the chlo- 
tanthic flowers which may function as buds. The case is perhaps 
parallel to the adventitious buds on the leaves. 
The conditions which favor the development of. these flowers 
are not evident. It may be, as suggested by Grout for adventi- 
tious buds, that an abundance of moisture is very essential. It 
seems from FERNALD’s observations and my own that chloranthic 
flowers in Drosera species are formed only in plants which grow in 
water. The bearing of such cases of reversion of flowers to vege- 
tative buds on our general conception as to the relation of sexual 
and asexual reproduction is not very clear. It appears, however, 
that under unfavorable conditions vegetative reproduction replaces 
in part, if not altogether, the sexual method. This is contrary 
to our general conception of reproduction, since it is commonly con- 
ceded that under favorable conditions vegetative reproduction 
prevails almost entirely to the exclusion of sexual reproduction. 
CotumsBia UNIVERSITY 
LITERATURE CITED 
1. Ames, O., An easy method of propagating Drosera filiformis. Rhodora 
1:172. pl. 8. 1899. 
2. Drxon, H., Adventitious buds in Drosera rotundifolia. Notes from 
the Botanical School of Trinity College, Dublin 144-145. 1901. 
3- Fernatp, M. L., A peculiar variety of Drosera rotundifolia. Rhodora 
7:8, 9. 1905. 
4. GorseEL, K., Einleitung in die experimentelle Morphologie der Pflanzen. 
1908 (p. 196, fig. 97). 
