Sea Mayweed Tripleurospermum maritimum and Scentless Mayweed T. inodorum (Asteraceae) intermediates in Orkney
DOI:
https://doi.org/10.33928/bib.2021.03.297Keywords:
nigriceps, phaeocephalum, achene, oil-gland, rib, phyllaryAbstract
This article describes a study of Tripleurospermum maritimum (L.) W.D.J. Koch and T. inodorum (L.) Sch. Bip. (Asteraceae) in the Orkney Islands (v.c.111), the results of which suggest that intermediates between these taxa may be rather common, and that T. maritimum subsp. nigriceps and subsp. maritimum are both involved, the former more frequently. Obviously this results in a complex taxonomic situation, evidently not confined to Orkney in the far north. Key identifying characters of the taxa are systematically examined and guidance offered on determining hybrids using a population level approach. The taxonomic complexities of these northern populations are discussed, with regard in particular to the identity of T. inodorum occurring there and the place of T. maritimum subsp. nigrescens in the forms and subspecies of T. maritimum found in the north Atlantic region.
Downloads
Published
Issue
Section
License
Copyright (c) 2021 John Crossley, Christopher A. Skilbeck
This work is licensed under a Creative Commons Attribution 4.0 International License.
Copyright and licence: Authors (or their employers) retain their copyright in articles and images published in British & Irish Botany and are not required to assign this to the Botanical Society of Britain & Ireland (BSBI). All that BSBI requires from authors is a license to publish the article in British & Irish Botany and make it freely available to all in pdf format under the terms of Creative Commons Attribution 4.0 International Public License, which also enables BSBI to reproduce components of the article in other BSBI outputs (eg. BSBI News, the BSBI website and/or the BSBI News & Views blog) for publicity purposes. The licence code can be accessed here: