Comparison of Mature Leaf Architecture of Three Types in Sorbus L. (Rosaceae)

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Abstract
Architecture of 3 leaf types in Sorbus [S. decora, S. alnifolia and S. hybrida] L. was investigated to discern differences in form and venation of compound and simple leaves. Leaflets of compound leaves have a semicraspedodromous venation with percurrent tertiaries and occasional intersecondaries. Simple leaves show a regular craspedodromous pattern with percurrent tertiaries and no intersecondaries. Leaves of S. hybrida L. vary from simple or lobed to a form with a lobed apical lamina and 2 pairs of basal leaflets. The apical laminar portion has craspedodromous secondaries, ramifying tertiaries and frequent intersecondaries. Leaflets also show a craspedodromous pattern but with irregularly branched secondaries, tertiaries and intersecondaries. All forms are similar in minor venation and marginal characteristics, including modified rosoid teeth which are structurally similar to platanoid teeth found in the Hamamelididae. The lower ranked leaves of S. hybrida show a regressed level of venation organization from the other species studied.

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