The cover. A typical morphology of Betula pubescens, the species that dominates birch woodlands in Iceland. It is shrub-like and polycormic, and it often has prostrate habit. Leaf characteristics including leaf shape, leaf tip, margin, and leaf base indicate introgressive hybridization with dwarf birch species [cf2] B. nana. [cf1] Cytogenetic and molecular studies have confirmed the occurrence of introgression in nature. See Thorsson et al. pp. 404-408. Photo by K. Anamthawat-Jonsson.
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