''Hieracium naviense'' is a very rare species of

hawkweed ''Hieracium'' (), known by the common name hawkweed and classically as (from ancient Greek ἱέραξ, 'hawk'), is a genus of flowering plant in the family Asteraceae, and closely related to dandelion (''Taraxacum''), chicory (''Cichorium''), ...

which has been given the common name of Derby hawkweed. It is a native perennial plant of limestone cliffs, first discovered in

Derbyshire Derbyshire ( ) is a ceremonial county in the East Midlands of England. It borders Greater Manchester, West Yorkshire, and South Yorkshire to the north, Nottinghamshire to the east, Leicestershire to the south-east, Staffordshire to the south a ...

, England, at

Winnats Pass Winnats Pass (or Winnats, as shown on some Ordnance Survey maps) is a hill pass and limestone gorge in the Peak District of Derbyshire, England. The name is a corruption of 'wind gates' due to the swirling winds through the pass. It lies west o ...

(SK1382) by J.N. Mills in 1966, and described by him as a new species in 1968. According to ''The Flora of Derbyshire'', it has been refound there on a number of occasions since, including in 1981 by UK hawkweed expert P.D. Sell, who declared it "a good species". Like many

apomictic In botany, apomixis is asexual reproduction, asexual development of seed or embryo without Fertilisation, fertilization. However, other definitions include replacement of the seed by a plantlet or replacement of the flower by bulbils. Apomictic ...

species of ''Hieracium'', it has an extremely localised distribution and requires specialist knowledge to recognise it. Apart from the two limestone cliffs found within a single 1 km square in the Derbyshire

Peak District The Peak District is an Highland, upland area in central-northern England, at the southern end of the Pennines. Mostly in Derbyshire, it extends into Cheshire, Greater Manchester, Staffordshire, West Yorkshire and South Yorkshire. It is subdivi ...

, it has never been recorded anywhere else in Britain, or indeed the world. The only other vascular plant endemic to Derbyshire (i.e. found nowhere else) is the bramble '' Rubus durescens''.

Conservation status

This endemic plant species was previously regarded as being Nationally Rare (NR) and Vulnerable (VR) in the national UK conservation list but its status was upgraded to the IUCN-defined conservation category of Critically Endangered (CR) in England's Vascular Plant Red List, first published in 2014.

References

{{Taxonbar, from=Q22286630 naviense