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Generative reproduction in Allium oleraceum (Alliaceae)
Helena Åström and Carl-Adam Hæggström
Annales Botanici Fennici
Vol. 41, No. 1 (2004), pp. 1-14
Published by: Finnish Zoological and Botanical Publishing Board
Stable URL: http://www.jstor.org/stable/23727168
Page Count: 14
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The field garlic Allium oleraceum is reproducing by subterraneous bulbs, and above ground by bulbils and seed. Two chromosome numbers, tetraploid (2n = 32) and pentaploid (2n = 40) have been found in Finland and Sweden. The seed production was studied in some population of A. oleraceum mainly in south Finland. The fruits mature only if visited by insects and the seed ripen only in favourable, that is warm and not too dry, summers. Several insect species of the orders Hymenoptera, Diptera and Lepidoptera were found to visit flowers of Allium oleraceum. The most frequent visitors were Bombus lapidarius (Apidae), Dolichovespula norwegica and D. saxonica (Vespidae), Eumenes spp. (Eumenidae), Volucella spp. and Syrphus spp. (Syrphidae), Pieris napi (Pieridae) and Autographa gamma (Noctuidae). Wasps of the family Vespidae are very regular visitors in the flowers of Allium oleraceum. Thus we suggest that Allium oleraceum is a species which has "wasp blossoms". Both tetraploid and pentaploid plants are visited by insects and they both produce viable seed. The seed is described. In germination tests most of the seeds of both ploidy levels germinated well.
Annales Botanici Fennici © 2004 Finnish Zoological and Botanical Publishing Board