Exceptional whitebeam

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Exceptional whitebeam
Systematics
Eurosiden I
Order : Rose-like (rosales)
Family : Rose family (Rosaceae)
Sub tribus : Pome fruit family (Pyrinae)
Genre : White berries ( sorbus )
Type : Exceptional whitebeam
Scientific name
Sorbus eximia
Kovanda

The unusual whitebeam ( Sorbus eximia ) is a species from the complex of bastard whitebeams ( Sorbus latifolia agg.).

description

The unusual whitebeam is a tree or shrub that can grow up to 16 m high. The leaves measure 9.5 to 11.5 (rarely 8 to 12.5) × 6.5 to 9 (rarely 5.5 to 10.5) centimeters and are broadly ovate to elliptical. They have 8 to 10 pairs of lateral nerves and are wedge-shaped at the base. The petiole is 23 to 29 millimeters long. The fruits are orange-red, broadly elliptical to spherical and have small lenticels . The fruit compartments are thin. The number of chromosomes is 2n = 51. The species reproduces apomictically .

distribution

This species is endemic to the area around Srbsko in the Bohemian Karst (Central Bohemia, Czech Republic). There are around 200 copies at 10 locations.

habitat

The unusual whitebeam grows in partially shaded oak forests, on the edges of forests and in the edges of semi-arid / dry lawns. It can also be found in abandoned quarries and prehistoric settlements. Sorbus eximia grows together with other whitebeams such as the service tree ( Sorbus torminalis ) and the Danube whitebeam ( Sorbus danubialis ).

The species was also planted as a street tree between Řevnice and Mořina.

Systematics

The extraordinary whitebeam was first described by Miloslav Kovanda in 1984. The type epithet eximia means extraordinary.

Individual evidence

  1. ↑ a b c d Herfried Kutzelnigg: Sorbus . In: Hans J. Conert u. a. (Ed.): Gustav Hegi, Illustrated Flora of Central Europe. Volume 4 Part 2B: Spermatophyta: Angiospermae: Dicotyledones 2 (3). Rosaceae 2 . Blackwell 1995. ISBN 3-8263-3014-5 .

literature

  • Petr Vít, Martin Lepší & Petr Lepší (2012): There is no diploid apomict among Czech Sorbus species: a biosystematic revision of S. eximia and discovery of S. barrandienica .
  • Arto Kurtto, Alexander N. Sennikov & Raino Lampinen (2018): Atlas Florae Europaeae. Vol. 17. Rosaceae ( Sorbus s. Lato). 132 pages.