IVe Conférence Internationale de Génétique (1911)
Campanula Pyraversi
F. Cayeux


For some years I have grown a new Campanula, a hybrid of C. versicolor x C. pyramidalis.

The plant is doubtless a hybrid between these two species, as is shown by its intermediate character, and also by the fact that it is self-fertile, and fertile with the pollen of either of the parent species. A detailed description of the parent species, and of the hybrid, are given by the author, the following points being of interest:

A certain number of the chief characters of the hybrid are intermediate between those of the parent species. Such a character is the height of the flowering stems, which in C. pyramidalis are 1 m. 50-2 m. in C. versicolor 0 m. 50-0 m. 75, and in the hybrid 1 m.-1 m. 25. Again, in C. versicolor the stem leaves are few in number, at the base of the inflorescence, in C. pyramidalis they attain the summit of the inflorescence, and in the hybrid they ascend half way up the inflorescence. A constant character of C. versicolor is the ring of dark blue or violet at the base of the petals; this is completely absent in C. pyramidalis and in the hybrid it is less marked than in C. versicolor.

Other intermediate characters are the thickness of the petals, and the number of flowers in each group on the inflorescence.

Certain characters of the hybrid are much nearer the corresponding characters of one or other of the parents. Such are the glandular teeth which are found on the leaves of C. pyramidalis. Another paternal character found in the hybrid is the duration of the flowering period.

Finally, in the hybrid are found certain features which do not exist in either parent. Among these are the length of the petioles, and the length of the floral pedicels, both of which are longer than in either parent.