Biology of flowering and fruiting in some members of the genus Sorbus in the Ukraine.
A general account of observations on the native S. aucuparia and S. torminalis and the commonly planted exotics S. aria, S. domestica, S. intermedia, S. mougaetti [S. mougeotii], S. × hybrida, × Crataegosorbus miezurinii [C. miczurinii] (S. aucuparia × Crataegus sanguinica [C. sanguinea]) and S. aucuparia × Aronia melacarpia [A. melanocarpa] [= × Sorbaronia fallax], with special reference to the Central Botanical Garden of the Ukrainian Academy of Sciences in Kiev. A biennial fruiting habit was observed in 1980-83 (abundant in even years), with the intergeneric hybrids showing the least variation. Pollen viability was 46-78% in different species, some viability remaining even after 45 days. Analyses are tabulated for the fruits of S. aria, S. aucuparia, S. domestica and S. torminalis. The fruits of S. aucuparia were the richest in vitamin C and carotene but also the most acid, whereas those of S. domestica were the sweetest and the poorest in vitamins.