Knotenbau und Blattgrundvaskularisation bei einigenGentianaceae

As a rule,Gentianaceae exhibit a double unilacunar nodal pattern. Upon leaving the lacun, the complex leaf trace divides first into three branches, and then into five or more bundles which become the leaf veins. OnlyGentiana lutea (andG. punctata) as well asMenyanthes trifoliata differ from all other species investigated by their multilacunar nodes. BothCentaurium andOrphium within the cortex form a completely closed bundle ring around the nodal flanks from smaller bundles which depart from the lateral branches of the complex leaf traces.