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PJB-1992-27
PRIMARY VASCULAR ORGANIZATION OF TESSARIA-ABSINTHIOIDES (COMPOSITAE)
Abstract
The primary vascular system of the shoot of Tessaria absinthioides was studied by the use of serial cross sections. It is a system of the open type, with eight sympodia, 2/5 helical phyllotaxy and trilacunar three-trace nodes. All the bundles are interpreted as leaf traces diverging towards the left along a sinistrorse genetic spiral. Leaf insertion is of the separated type and there are two sets (2 + 3) of contact parastichies in the apex. The phylogenetic implications of these characters are discussed.
