Slovak whitebeam
| Slovak whitebeam | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Sorbus slovenica | ||||||||||||
| Kovanda |
The Slovak whitebeam ( Sorbus slovenica ) is a species from the bastard whitebeam group .
features
The Slovak whitebeam is a shrub or small tree that reaches heights of 2 to 5 meters. The bark is smooth when young, later scaly.
The leaf blade of the middle leaves of short shoots (14) 16–22 (25) mm are long stalked, ovate to broadly ovate, rarely rounded, (8.3) 9.2–11.0 (12.0) cm long and (6.3) 6.5-8.6 (8.8) cm wide, (1.07) 1.22-1.52 (1.58) times as long as wide, lobed (lobes pointed, ± triangular; the lobes 1 2–2 2 [30]%), double to single serrated, with 10–12 (13) lateral nerves on each side. The distance between the lateral nerves in the middle of the half of the blade is (5.5) 7.0–9.5 (10.0) mm. The underside of the leaf is hairy gray-tomentose. The fruit is spherical to ellipsoidal, rarely obovate, 11–14 mm long and 1 2–1 3 mm wide, with persistent sepals, red, rarely red-brown, with approx. 380–500 lenticels ; largest lenticels 0.6–0.8 mm in diameter.
Occurrence
Sorbus slovenica occurs in Slovakia in the Čachtické Mountains, and also between the villages of Čachtice and Višňové. In Austria, Sorbus slovenica has been recorded for Burgenland (western Leitha Mountains: Lebzelterberg) and for Pannonian Lower Austria, namely for the Hainburg Mountains (Pfaffenberg, Hundsheimer Berg, Hexenberg) and for the thermal bath line (NSG Glaslauterriegel-Heberlberg-Flugsberg, Pfaffstättner Kogel and des Anninger: Kegelstattweg). The Slovak whitebeam grows on shallow dry rock lawns and in xerothermal downy oak forests .
Systematics
Sorbus slovenica was first described by Miloslav Kovanda in 1961. The holotype is kept in the herbarium of Charles University in Prague (PRC). The whitebeam is a hybrid of Sorbus torminalis and Sorbus danubialis or Sorbus collina . The statement by Marhold (2007) that the species has a double set of chromosomes and is therefore diploid has not been proven. In this case, Sorbus slovenica would be unfixed and a synonym for Sorbus x decipiens , Sorbus aria s. st. to be accepted as a crossing partner.
Sennikov and Kurtto have been running the species under the name Karpatiosorbus slovenica since 2017 . Christenhusz, Fay and Byng assign the whitebeam 2018 to the pear genus Pyrus and name it Pyrus slovenica .
supporting documents
- Manfred A. Fischer: Corrections as well as taxonomic and floristic supplements and updates to the 3rd edition (2008) of the excursion flora for Austria, Liechtenstein and South Tyrol, continuation. In: Neilreichia 7, pp. 231-293, 2015.
- Gerhard Jakubowsky, Walter Guterman: The Sorbus latifolia group in eastern Austria. In: Ann. Naturhist. Mus. Vienna, 1996.
- Miloslav Kovanda: Spontaneous hybrids of Sorbus in Czechoslovakia. In: Acta Univ. Carol. Biol., Pp. 41-83, 1961.
- Marhold, K., Mártonfi, P., Mereďa jun., P. & Mráz, P .: Chromosome number survey of the ferns and flowering plants of Slovakia. - VEDA, Bratislava 2007.
- Alexander Sennikov, Arto Kurtto: A phylogenetic checklist of Sorbus sl (Rosaceae) in Europe. In: Memoranda Soc. Fauna Flora Fennica 93, pp. 1-78. https://journal.fi/msff/article/view/64741 . 2017.
- Maarten MJ Christenhusz, Michael F. Fay, James W. Byng: The Global Flora Special Edition: GLOVAP Nomenclature Part 1, 2018.