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    • Keywords


      Asclepiadaceae; xylem differentiation; cotyledonary node

    • Abstract


      Two-day and eight-day old seedlings ofAsclepias curassavica, Calotropis procera andLeptadenia pyrotechnica were studied. The basipetally differentiating epicotylar vasculature and the root-hypocotyl-cotyledonary vasculature are ontogenetically separate units. The cotyledonary node is unilacunar two-trace and the foliar nodes, unilacunar one trace. The unilacunar two trace cotyledonary nodes in advanced families like Apocyanaceae and Asclepiadaceae seem phylogenetically significant.

    • Author Affiliations


      S Satija1 S C Goyal2 A Pillai1

      1. Department of Botany, University of Rajasthan, Jaipur - 302 004, India
      2. College of Agriculture, Haryana Agricultural University, Kaul - 132 021, India
    • Dates


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