Peculiarities of flowering in symphytum asperum cultivated in the komi assr russian sfsr ussr

Frolov, Y.M.; Frolova, N.P.

Rastitel'nye Resursy 15(2): 216-223


ISSN/ISBN: 0033-9946
Accession: 006076854

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Data are presented from a study conducted in 1970-1977 on comfrey, S. asperum Lepech., regarding duration and intensity of flowering, daily rhythm of flowering, bloom longevity and pollination in connection with insect-pollinators. When cultivated in the mid-taiga zone of the Komi ASSR the species begins its generative phase in the 2nd year. Long duration of flowering (60-90 days) is characteristic for S. asperum as a result of the formation of a large number of blooms. Flowering begins from the lower bostryx of the central panicle and spreads acropetally, after which it is transmitted to the side shoots. Flower dehiscence may occur throughout the entire daylight period (13-19 h), coinciding with the highest daily air temperature. S. asperum is a cross-pollinated entomophilous plant and possesses several morphological and biological adapations: large inflorescences, a brightly colored corolla, nectar, protandry etc. Pollination is achieved with the aid of honeybees and bumblebees, whose flight is determined by meterological conditions.