dichotomous venation

dichotomous venation

[dī‚käd·ə·məs ve′nā·shən]
(botany)
A vascular arrangement in leaves such that the veins are forked, with each vein dividing at intervals into smaller veins of approximately equal size.
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In the simplest cases the phylloids became united by the development of parenchymatous tissues betwen them, thus forming a foliar appendage with open dichotomous venation. Webbing accompanied by overtopping, as described above, led to a leaf with pinnate venation.