Abstract
Some <em>Magnoliaceae</em> cultivated in Poland were investigated: <em>Liriodendron tulipifera</em> L. and 6 species of magnolia: <em>Magnolia acuminata</em> L., <em>M. denudata</em> Desr., <em>M. kobus</em> DC., <em>M. obovata</em> Thunb., <em>M. salicifolia</em> Maxim. and <em>M. tripetala</em> L. For alkaloid detection in the leaves thin-,layer chromatography was used. In <em>Liriodendron tulipifera</em> L. and in all the Magnolia species liriodenine which exhibits cytostatic activity was detected. The extract of <em>Liriodendron tulipifera</em> L. leaves showed, beside liriodenine other spots on the chromatogram than did the magnolias. Alkaloids can be utilized in the chemotaxonomy of <em>Magnoliaceae</em> as a diagnostic trait. The results of the investigations indicate a certain distinctiveness of <em>M. acuminata</em> L., in agreement with those obtained by way of numerical taxonomy. Most similar as regards alkaloid content in leaves are <em>M. obovata</em> Thunb. and <em>M. tripetala</em> L.
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