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311
28. The enormous polymorphy characterizing the section Caninae
might, to a large extent, be ascribed to this obvious hybridism.
However, mutation phenomena have no doubt contributed to the
polymorphy. In this case, the mutations must be vegetative, pro-
duced in apomictical stocks. Marsson (Svensk Bot. Tidskr. 1912)
has in a sowing of tomentosa *subcristata found some forms diffe-
ring from the mother. The flowers had not been castrated.
Nevertheless, that one of these new forms which I examined pro-
bably was not produced in a sexual way, is evident from the
chromosome set being quite the same as that of the investigated
tomentosa-forms representing the F,-type (7 gemini and 21 unpaired
chromosomes).
Botanical Labratory, Stockholms Hégskola. June, 1920.
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