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Type: Journal article
Title: A new British species Senecio eboracensis (Asteraceae) another hybrid derivative of S. vulgaris L. and S. squalidus L.
Author: Lowe, A.
Abbott, R.
Citation: Watsonia, 2003; 24:375-388
Publisher: Botanical Society of the British Isles
Issue Date: 2003
ISSN: 0043-1532
Statement of
Lowe, A.J. and Abbott, R.J.
Abstract: A new species of Senecio from York, England, is described and named as Senecio eboracensis. Evidence is reviewed that this fully fertile, tetraploid species (2n = 40), which was first discovered in 1979, is a hybrid product of S. vulgaris (2n = 40) and S. squalidus (2n = 20), and is distinct from another tetraploid hybrid product, the stabilized introgressant, S. vulgaris var. hibernicus, and also from the hexaploid hybrid product, S. cambrensis. Other studies have shown that S. eboracensis is reproductively isolated from its parents due to a high level of selfing, phenological separation, sterility of products of back crosses to S. squalidus and reduced fertility of products of back-crosses to S. vulgaris. The morphological similarity of S. eboracensis to partially fertile, intermediate hybrid plants collected from other locations in the British Isles is discussed, and would indicate that it could arise polytopically following hybridisation between the two parent species. However, other such intermediate hybrid products do not appear to have persisted at their site of origin.
Keywords: Hybrid evolution; speciation; Senecio; Asteraceae; allopolyploidy; introgression
RMID: 0020071451
Appears in Collections:Earth and Environmental Sciences publications
Environment Institute Leaders publications

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