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Hieracium cacuminum, Summit Hawkweed, is a rare endemic Welsh hawkweed which has been confused with H. siluriense. A review of the records and field work showed that 240 plants are known in three sites; it was not refound in three other sites. It occurs on Old Red Sandstone cliffs and rocks in the Brecon Beacons. It is ‘Endangered ’ under the IUCN Threa