Conservation of Britain's biodiversity: Hieracium neocoracinum (Asteraceae), Craig Cerrig-gleisiad Hawkweed

摘要

Hieracium neocoracinum Pugsley (Asteraceae), Craig Cerrig-gleisiad Hawkweed, is a very rare, endemic plant, confined to Craig Cerrig-gleisiad National Nature Reserve in the Brecon Beacons (v. c. 42), Wales. It was first found in 1895 and has occurredin at least two places within Craig Cerrig-gleisiad. In 1975, its population was estimated to be 60 plants in one population. Field surveys in 2003 revealed 147 plants at the same place, and it was not refound in the second site. The population increaseis probably due to colonisation of bare ground created by a landslip, and relaxation of grazing- Seed was collected for the Millennium Seedbank, and it is being cultivated at the National Botanic Garden of Wales.