Abstract
In this study, the Turkish representatives of Frangula alnus were investigated in terms of wood, leaf and petiole anatomy. Some important differences were observed between the two native subspecies F. alnus subsp. alnus and F. alnus subsp. pontica. These include the grouping and frequency of vessels, the size of vessel fibres and rays, and the presence of cubic and solitary crystals in square ray cells. Significant differences in the distributions of secretory cavities and crystals in the leaves and petioles were also observed. The described features provide a useful complementary key for the distinction of the two subspecies native to Turkey that is applicable both to fresh material and macrofossil remains.
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