Rubus durescens

Rubus durescens is a rare British species of flowering plant in the rose family. It is native to England, where the entire global distribution of this bramble is found only within the southern half of the county of Derbyshire. It occurs in hedges, shrubs, wood and heathy areas, and was first described and named in 1892 by the Derbyshire botanist William Richardson Linton.[1][2] Linton placed an illustration of the plant in gold leaf on the cover of the 1903 version of The Flora of Derbyshire, of which he was the sole author.[3][4]

Rubus durescens
Linton's 1903 The Flora of Derbyshire showing Rubus durescens in gold leaf
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Rosales
Family: Rosaceae
Genus: Rubus
Species:
R. durescens
Binomial name
Rubus durescens
Derbyshire distribution map of Rubus durescens showing all known records plotted at an accuracy of 10 km x 10 km square

Description and distribution

Rubus durescens has deep pink flowers and, according to Linton, "occurs in plenty over an area of some five miles by four to the north and east of Shirley".[5] He recorded the species between Ambergate and Whatstandwell in the north of its range, through Bradley Wood and Duffield in the centre, down to between Church Broughton and Sutton on the Hill in the southern part of its range. The 1969 version of The Flora of Derbyshire, by A.R.Clapham, also noted the plant in Bradley Wood as well as near Cross o' th' Hands.[6] The 2015 version of The Flora of Derbyshire noted that the plant's range had remained unchanged, listing locations at Mugginton Sand Quarry, Nether Heage, Lower Hartshay and Swanwick.[7]:89

Conservation status

Although many microspecies have no formal conservation status in the UK, Cheffings and Farrell in their 2005 Vascular Plant Red Data List for Great Britain suggested that all populations of local endemics such as Rubus should, when found in fewer than five 10 km (6.2 miles) × 10 km squares, be considered as "threatened".[8] As a result, Rubus durescens is now included on the 2015 Derbyshire Vascular Plant Red Data List in the category "Nationally Rare".[7]:418

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References
  1. Linton, W.R. (1892). "A new Rubus". Journal of Botany, British and Foreign. 30: 70–71. Rubus durescens, n. sp.—Stem arcuate, five-angled, its sides 7 flat or slightly furrowed in the upper part, glabrous or with a few . scattered hairs, purple and dark brown, smooth, shining. Prickles, on the angles, slender, declining, about twice ..
  2. Ray Desmond (25 February 1994). Dictionary Of British And Irish Botantists And Horticulturalists Including plant collectors, flower painters and garden designers. CRC Press. pp. 431–. ISBN 978-0-85066-843-8.
  3. Linton, W.R. (1903). The Flora of Derbyshire. Derby: Bemrose. Retrieved 5 October 2015.
  4. The Naturalist: A Monthly Journal of Natural History for the North of England... Simpkin, Marshall and Company. 1908. p. 51. He described and named Rubus durescens, a very distinct bramble belonging to the Rhamnifolii section, a representation of which adorns the cover of the ' Flora of Derbyshire,' ...
  5. Edees, Eric Smoothey (1963). "Notes on Derbyshire bramble" (PDF). BSBI Proceedings. 5: 13–19.
  6. Clapham, A.R., ed. (1969). The Flora of Derbyshire. Derby Museum.
  7. Willmot, Alan; Moyes, Nick (2015). The Flora of Derbyshire. Pisces Publications. ISBN 978-1-874357-65-0.
  8. Cheffings, Christine; Farrell, Lynne (2005). "The Vascular Plant Red Data List for Great Britain" (PDF). JNCC. Retrieved 4 October 2015.
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