Conservation of Britain’s biodiversity: Status of the rare English endemic Hieracium mammidens (Breast-toothed Hawkweed; Asteraceae)
DOI:
https://doi.org/10.33928/bib.2024.06.153Keywords:
apomixis, IUCN threat statusAbstract
Hieracium mammidens P.D.Sell, Breast-toothed Hawkweed, is a rare South-east England endemic. Common garden experiments showed that minor differences between populations at Waltham Park and Caesar’s Camp are not sufficient to recognise separate taxa. Excision of florets on five plants showed that seed is produced in similar amounts to control heads, thus demonstrating it is apomictic. A survey of all sites in 2024 found 162 plants in four populations; it was not refound in seven sites and is unconfirmed in another four sites. It is IUCN Threat Status ‘Endangered’.
References
British Geological Survey 2024; Geology Viewer. [Accessed February 2024]. Available at: geologyviewer.bgs.ac.uk
IUCN (2012). IUCN Red List Categories and Criteria: Version 3.1. 2nd ed. Gland, Switzerland and Cambridge, UK: IUCN. iv + 32pp. [Accessed online 26 February 2024].
McCosh, D.J. & Rich, T.C.G. 2018. Atlas of British and Irish Hawkweeds (Pilosella Hill and Hieracium L.). 2nd ed. Harpenden: Botanical Society of Britain and Ireland.
Philp, E.G. 2010. A new Atlas of the Kent flora. Kent: Kent Field Club.
Rich, T.C.G. 2023. Millennium Seed Bank Threatened Flora Project Seed Collecting Final Report for 2021-2023. November 2023. Unpublished report to Royal Botanic Gardens, Kew.
Rich, T.C.G. 2024. Hieracium mammidens Breast-toothed Hawkweed Survey 2024. Unpublished manuscript, 21 pp. May 2024.
Rodwell, J.S., ed., 1991a. British plant communities, volume 1 Woodlands and scrub. Cambridge: Cambridge University Press.
Rodwell, J.S., ed., 1991b. British plant communities, volume 2 Heaths and mires. Cambridge: Cambridge University Press.
Sell, P.[D.] & Murrell, G. 2006. Flora of Great Britain and Ireland, volume 4. Cambridge: Cambridge University Press.
Shaw, M.M. 2018. Hieracium L. In: Abraham, F., Briggs, M., Harmes, P., Hoare, A., Knapp, A., Lording, T., Scott, B., Shaw, M., Streeter, D. & Sturt, N., eds. The Flora of Sussex, 285-291. Newbury: Pisces Publications/Sussex Botanical Recording Society.
Shaw, M.M. 2020. Hawkweeds of South-east England. BSBI Handbook no. 20. Durham: Botanical Society of Britain and Ireland.
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