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PRIMARY VASCULAR ORGANIZATION OF TESSARIA-ABSINTHIOIDES (COMPOSITAE)
DEGANO CAM; MUJICA MB
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.
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