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PETIOLE ANATOMY IN ASTRAGALUS SECT. INCANI DC. (FABACEAE) IN IRAN (A PHYLOGENETICAL APPROACH).

Mehrabian A. R. نويسنده , Zarre Sh. نويسنده , Azizian D. نويسنده , Podlech D. نويسنده

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Cross sections of petioles in 24 species of Astragalus Sect. Incani has been studied for a comparison of anatomical characters based on phylogeny in this section. The characters which employed in this study arc as follows: Numbers of parenchymatous cell layers in pith. numher of bundles, length of ventral axis, length of dorsiventral axis, diameter of ventral lateral vascular hundle (VLB) and diameter of dorsal median bundle (DMB). Furthermore the evolutionary direction in anatomical characters (character polarity) is studied. The results reveal that anatomical characters are not useful for circumscribing section hut arc suitable evidences for taxonomical differentiation in species in this section and can be use for delimiting small natural groups. Moreover. they arc helpful characters for determining some complexes in this section.

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