The vegetation has some brackish influence because of occasional influx of the sea during winter storms with rushes such as saltmarsh rush ("Juncus gerardi") and sea club–rush ("Scirpus maritimus"). The surrounding grassland, which is also a cricket pitch, is notable for the clovers amongst its flora including western clover ("Trifolium occidentale"), suffocated clover ("T. suffocatum") and subterranean clover ("T. subterraneum"). Other plants include adder's-tongue ("Ophioglossum vulgatum") and small adder's-tongue ("O. azoricum"). St Agnes is visited by birdwatchers, particularly during the ″Scilly season″ of September and October. Among the many vagrant birds which have been found here around this time are the following, which were all ″firsts″ for Britain:  In addition:  Among rare vagrants recorded at other times of year are the following:  St Agnes is one of the five civil parishes of the Isles of Scilly, which are also wards. The civil parish and ward include Gugh and several uninhabited islands and rocks, including the Western Rocks, Annet, Rosevear, Pednathise Head (the southernmost land in the UK) and the Bishop Rock. St Agnes returns one councillor to the Council of the Isles of Scilly, the same as the other "off-island" wards. The civil parish is not functional however, and there is no council or meeting.