Morphometric analysis of Dactylorhiza occitanica and related populations from eastern France (Orchidaceae)

Citation
D. Tyteca et Jl. Gathoye, Morphometric analysis of Dactylorhiza occitanica and related populations from eastern France (Orchidaceae), BELG J BOT, 132(2), 1999, pp. 158-174
Citations number
28
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Plant Sciences
Journal title
BELGIAN JOURNAL OF BOTANY
ISSN journal
0778-4031 → ACNP
Volume
132
Issue
2
Year of publication
1999
Pages
158 - 174
Database
ISI
SICI code
0778-4031(1999)132:2<158:MAODOA>2.0.ZU;2-5
Abstract
Morphometric examination and multivariate statistical analyses have been ap plied for the study of five populations of Dactylorhiza occitanica Geniez, Melki, Pain & Socca, a recently described taxon from lowland areas in south ern France, as well as four critical Dactylorhiza populations from mountain ous regions in eastern France. The homogeneity of D. occitanica as an indep endent species within the D. majalis group was substantiated, although one of the samples showed some divergence, probably induced by isolation and ec ological conditions. The resemblance and segregation of D. occitanica from allied species such as D. praetermissa and D. elata is discussed, as well a s the probable hybridogenous influences that characterize all members of th e group. The four critical populations are discussed in the same perspectiv e. Although they show some resemblance with either D. praetermissa or D. oc citanica, they are not attributable to them and probably resulted from inde pendent hybridization events under peculiar conditions of isolation. Especi ally in one case (Chaffois, Doubs), these populations may be the departure point for the establishment of separate, well defined species.