TY - JOUR
T1 - Indigenous species of Crataegus (Rosaceae-Maloideae) in Flanders (Belgium)
T2 - an explorative morphometric study
AU - Depypere, Leander
AU - Vander Mijnsbrugge, Kristine
AU - De Cock, Katrien
AU - Verschelde, Pieter
AU - Quataert, Paul
AU - Van Slycken, Jos
AU - Goetghebeur, P
N1 - Publication Authorstring : Depypere, L.; Vander Mijnsbrugge, K.; De Cock, K.; Verschelde, P.; Quataert, P.; Van Slycken, J.; Goetghebeur, P.
Publication RefStringPartII : <i>Belgian Journal of Botany 139(2)</i>: 139-152
PY - 2006
Y1 - 2006
N2 - The taxonomy of the five Crataegus taxa indigenous in Flanders was studied through a morphometric analysis. The applicability of the taxonomic treatments of Christensen, the botanical authority on Crataegus in Europe, was evaluated. Leaf and fruit characteristics were analysed for a total of 186 individuals. The results show that C. monogyna and C. laevigata can easily be differentiated. The putative hybrids C. ×media, C. ×subsphaerica and C. ×macrocarpa are more difficult to delineate. C. ×media, the putative hybrid between C. monogyna and C. laevigata, shows a remarkably large range and overlap with both parental species for most of the characters studied. This phenotypic variation could be due to a shift in morphological characters through several generations of backcrossing with the parental species.Although C. rhipidophylla was not yet found in Flanders, populations of both putative hybrids with C. monogyna (C. ×subsphaerica) and C. laevigata (C. ×macrocarpa) were recently inventoried. The individuals identified as C. ×subsphaerica are hardly distinguishable from C. monogyna. Introgression with the C. monogyna parent may have obscured the diagnostic characters. Therefore, the presence of a typical population of C. ×subsphaerica in Flanders is questionable. On the contrary, the few individuals of C. ×macrocarpa form a distinct group.
AB - The taxonomy of the five Crataegus taxa indigenous in Flanders was studied through a morphometric analysis. The applicability of the taxonomic treatments of Christensen, the botanical authority on Crataegus in Europe, was evaluated. Leaf and fruit characteristics were analysed for a total of 186 individuals. The results show that C. monogyna and C. laevigata can easily be differentiated. The putative hybrids C. ×media, C. ×subsphaerica and C. ×macrocarpa are more difficult to delineate. C. ×media, the putative hybrid between C. monogyna and C. laevigata, shows a remarkably large range and overlap with both parental species for most of the characters studied. This phenotypic variation could be due to a shift in morphological characters through several generations of backcrossing with the parental species.Although C. rhipidophylla was not yet found in Flanders, populations of both putative hybrids with C. monogyna (C. ×subsphaerica) and C. laevigata (C. ×macrocarpa) were recently inventoried. The individuals identified as C. ×subsphaerica are hardly distinguishable from C. monogyna. Introgression with the C. monogyna parent may have obscured the diagnostic characters. Therefore, the presence of a typical population of C. ×subsphaerica in Flanders is questionable. On the contrary, the few individuals of C. ×macrocarpa form a distinct group.
U2 - 1854/11390
DO - 1854/11390
M3 - A1: Web of Science-article
VL - 139
SP - 139
EP - 152
JO - Belgian Journal of Botany
JF - Belgian Journal of Botany
IS - 2
ER -