Diagnosis.

Taxon classification

Plantae

Rosales

Rosaceae

Dönmez

Ali A.

Özderin

Sevgin

Additional contributions to taxonomy, nomenclature and biogeography of the Turkish

Crataegus

(

Rosaceae

) taxa

PhytoKeys1652019122113

10.3897/phytokeys.122.33002

Crataegus

azarolus

var.

senobaaensis

urn:lsid:ipni.org:names:77197217-1

Dönmez

var. nov.

Figure 1

Diagnosis.

This new variety differs from the other varieties (CrataegusazarolusL.var.minuta Browicz and CrataegusazarolusL.var.dentata Browicz and CrataegusazarolusL.var.aronia L.) by its deeply divided leaf sinuses, mostly 3–4 pairs of leaf lobes and mostly ovate-oblong leaves at outline.

Type.

TURKEY. Şırnak: 20 km from Uludere to Şırnak, above Şenoba, steppe, ca. 1250 m elev., 28. September 2002, A.A.Dönmez 11139, (holotype: HUB, isoptypes, HUB, EGE). Paratypes: Bitlis: Tatvan, Koruklu village, Yenitoprak district, 1734 m elev., hedge, 02.10.2013. A.A.Dönmez 18745-K.Özgişi. (HUB!).

Distribution.

(Figure 3). Crataegusazarolusvar.senobaaensis is endemic to southeast Turkey and it is known from two different locations.

Ecology and habitat.

Crataegusazarolusvar.senobaaensis grows in dry steppes from 1250 to 1735 m elevation.

Etymology.

The epithet denotes the type locality Şenoba.

Preliminary conservation status.

Crataegusazarolusvar.senobaaensis should be labelled as “Critically Endangered”, (CR B1+D) according to the IUCN (2017) threat categories. The area of occupancy is estimated to be smaller than 100 km² and the number of examined mature individuals is less than 50. Besides this, all of the examined specimens are known from habitats which are not under threat.

Figure 3.

Distribution of the taxa. (square)Crataegusazarolusvar.senobaaensis; (star) Crataegusmonogynavar.odemisii var. nov. (circle) Crataegusyaltirikii (Near East topographic map-blank.svg).

Figure 1.

Crataegusazarolusvar.senobaaensis Dönmez. A View of fruiting bush in steppe habitat B leaves of short shoot C mature fruits. (A.A. Dönmez 18745). Scale bar: 1cm.

IUCN (2017) Standards and Petitions Subcommittee. Guidelines for Using the IUCN Red List Categories and Criteria. Version 12. Prepared by the Standards and Petitions Subcommittee. http://www.iucnredlist.org/documents/RedListGuidelines.pdf