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Abstract

This paper is aimed at investigating leaf morphological variability and possible hybridization between two species within the Rosaceae family: the one-seed hawthorn (Crataegus monogyna Jacq.) and the almond-leaved pear (Pyrus spinosa Forssk.). These two genera are taxonomically related and meet many prerequisites for successful ­hybridization between them, which prompted us to investigate the possibility of the presence of a long-described yet uninvestigated hybrid called ×Pyrocrataegus. The research was conducted along the Eastern Adriatic coast, where both species are widespread and often grow together in open woodlands, forest edges and abandoned agricultural ­areas. The examination of morphological variability was based on a morphometric analysis of seven populations ­using ten phenotypic traits of leaves. In general, our results showed great variability of leaf morphological traits within and between the studied populations, as well as a clear differentiation between the two species. The results of principal component analysis (PCA) showed a few intermediate individuals between the two species, indicating possible ­hybridization. However, as heteroblasty is present in P. spinosa, with its seedlings reported to have lobed, hawthorn-like leaves, dimorphism could also result from the reappearance of juvenile leaves on adult trees by means of rejuvenation. In order to draw a definitive conclusion about the existence of hybrid individuals in the next study, DNA markers and a much larger sample, especially morphologically intermediate individuals per population should be included.

Keywords

Croatia hybrids heteroblasty morphometric analysis morphological variability Rosaceae

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Copyright (c) 2025 Antonio Vidaković, Zlatko Šatović, Zlatko Liber, Marko Jurica, Igor Poljak

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How to Cite
Vidaković, A., Šatović, Z., Liber, Z., Jurica, M., & Poljak, I. (2025). Leaf morphological variability of Pyrus spinosa and Crataegus monogyna and their potential hybridization. Acta Botanica Croatica, 84(2), 202–210. https://doi.org/10.37427/botcro-2025-016
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