title: Morphological variability of Helleborines. I. Diagnostic significance of morphological features in Epipactis helleborine (L.) Crantz, Epipactis atrorubens (Hoffm.) Besser and their hybrid, Epipactis ×schmalhausenii Richt. (Orchidaceae, Neottieae)
abstract: The comparative analysis of leaf morphology was performed in &lt;em&gt;E. helleborine&lt;/em&gt; (L.) Crantz, &lt;em&gt;E.atrorubens&lt;/em&gt; (Hoffm.) Besser, and their interspecific hybrid, &lt;em&gt;Epipactis&lt;/em&gt; ×&lt;em&gt;schmalhausenii&lt;/em&gt; Richt. The aim of this research was to find out features that would be useful in the taxonomy of the genus &lt;em&gt;Epipactis&lt;/em&gt;, and particulary their taxa of hybrid origin. In course of the studies special attention was paid to 
journal: Acta Societatis Botanicorum Poloniae