Abstract
Surveys of three Irish endemic Hieracium species were undertaken in 2006 and 2007 to provide information for their conservation. Hieracium argentatum mainly occurs on rocky riversides or open rocks, usually sandstone, in open vegetation. A total of 870 plants were found in seven sites, and the species was not refound in five sites. The extant populations currently appear to be healthy and under relatively low threat; it has an International Union for Conservation of Nature (IUCN) threat category of'Vulnerable'. Hieracium scullyi is found on acidic sandstone rocks on rocky riverbanks in the zone between winter floods and summer flows, on the associated rocks above, on rocks by lakes and rarely on bridges. A total of 210 plants were found in eight populations, and the species has disappeared from one site; it has an IUCN threat category of'Endangered'. Hieracium sparsifrons is also found in rocky rivers and on bridges in open vegetation. A total of 204 plants were found in the six known sites; the species has an IUCN threat category of 'Endangered'. The main threats are outlined. Some material has been collected for ex situ conservation. T.C.G. Rich (corresponding author; email: tim.rich?
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