Hieracium naviense

Hieracium naviense is a very rare species of hawkweed which has been given the common name of Derby hawkweed.[1]

It is a native perennial plant of limestone cliffs, first discovered in Derbyshire, England, at the Winnats Pass (SK1382) by J.N. Mills in 1966, and described by him as a new species in 1968.[2] According to the Flora of Derbyshire, it has been refound there on a number of occasions since, most recently in 2013, including in 1981 by UK hawkweed expert P.D. Sell, who declared it "a good species".[3]:263

Like many 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, 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.[3]:89

Hieracium naviense
Scientific classification
Kingdom: Plantae
Clade: Angiosperms
Clade: Eudicots
Clade: Asterids
Order: Asterales
Family: Asteraceae
Genus: Hieracium
Species: H. naviense
Binomial name
Hieracium naviense
J.N.Mills
Map of Derbyshire showing the only known location for H.naviense
Winnats Pass, Castleton, Derbyshire

Conservation status

This endemic plant species was previously regarded as being Nationally Rare (NR) and Vulnerable (VR) in the national UK conservation list[4] 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.[5][3]:418

References

  1. ^ "Hieracium naviense J.N. Mills [Derby Hawkweed]". NBN Gateway. Retrieved 10 October 2015.
  2. ^ Mills, J.N. (1968). "A new species of Hieracium in Derbyshire" (PDF). Watsonia. BSBI. 7 (1): 40–42. Retrieved 10 October 2015.
  3. ^ a b c Willmot, Alan; Moyes, Nick (2015). The Flora of Derbyshire. Pisces Publications. ISBN 978-1-874357-65-0.
  4. ^ "Conservation Designations for UK Taxa". http://jncc.defra.gov.uk. Joint Nature Conservation Committee (JNCC). Retrieved 10 October 2015. External link in |website= (help)
  5. ^ Stroh, P.A.; et al. (2014). "A Vascular Plant Red List for England" (PDF). Botanical Society for Britain and Ireland (BSBI). Retrieved 10 October 2015.

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