Sorbus pauca species nova, the first endemic species of the Sorbus hybrida group for the Czech Republic.

Martin Lepší 2 1 , Petr Lepší 3 , Jiří Sádlo 4 , Petr Koutecký 2 , Petr Vít 4 & Petr Petřík 4

Affiliations

  1. South Bohemian Museum in České Budějovice, Dukelská 1, CZ-370 51 České Budějovice, Czech Republic
  2. Department of Botany, Faculty of Science, University of South Bohemia, Branišovská 31, CZ-370 05 České Budějovice, Czech Republic
  3. AOPK ČR, Administration of the Blanský les Protected Landscape Area, Vyšný 59, CZ-381 01 Český Krumlov, Czech Republic
  4. Institute of Botany, Academy of Sciences of the Czech Republic, CZ-252 43 Průhonice, Czech Republic

Published: 29 January 2013

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Abstract

We describe a newly distinguished apomictic tetraploid (2n = 4x = 68) species Sorbus pauca M. Lepší et P. Lepší. We classify this new species as a member of the Sorbus hybrida group because we presume that it has originated from a cross between S. danubialis and S. aucuparia. Sorbus pauca, a stenoendemic that occurs on Bezděz and Malý Bezděz hills (Doksy region, northern Bohemia), is the first species of the S. hybrida group to be described for the Czech Republic. Multivariate morphometrics and elliptic Fourier analyses reveal that it is distinct from the morphologically close S. danubialis. The new taxon is phenotypicaly homogenous, morphologically well separated from the sympatrically occurring S. danubialis and European taxa of S. hybrida agg. It does not show any karyological variation. Apomixis was detected as the species’ sole mode of reproduction. The two known populations of S. pauca consist of 14 adult individuals. The species is restricted to rocky grasslands, rocky scrub and open woodlands on rocks with Festuca pallens and Cotoneaster integerrimus.

Keywords

apomixis, DAPI flow cytometry, geometric morphometrics, hybridization, karyology, multivariate morphometrics, Rosaceae, subg. Soraria, taxonomy

How to cite

Lepší M., Lepší P., Sádlo J., Koutecký P., Vít P. & Petřík P. (2013) Sorbus pauca species nova, the first endemic species of the Sorbus hybrida group for the Czech Republic. – Preslia 85: 63–80