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ANATOMY OF THE SEEDLING OF TESSARIA ABSINTHIOIDES (COMPOSITAE)

CLAUDIA A.M. DEGANO AND MARIA B. MUJICA*

Abstract: The anatomy of the seedling of Tessaria absinthioides was studied by the use of serial cross sections. Continuous with the diarch vascular system of the root there are bundles of two types in the hypocotyl: double bundles formed by two lateral groups of phloem and one of protoxylem, that will become the cotyledonary traces and intercalary collateral bundles formed by one median group of phloem and one group of metaxylem, going to the protophylls. T. absinthioides has unilacunar one-trace cotyledonary and protophyll nodes and trilacunar three-trace nomophyll nodes.

Facultad de Agronomia y Agroindustrias, UNSE. Av. Belgrano (S) 1912.4200 Sgo. del Estero, Argentina.
Departamento de Agronomia, UNS, Altos de Palihue, 8000 Bahia Blanca, Argentina.