Leaf Attachment


This page is from the Northern Ontario Plant Database website.


  • Node - the point of leaf attachment to a stem.
  • Internode - the region of the stem between leaves.
  • Connate-perfoliate - with bases of opposite leaves fused around the stem, which appear to go through the leaf.
  • Perfoliate - with the bases of a single leaf fused around the stem, which appear to go through the leaf blade.
  • Clasping (or amplexicaul) - a sessile leaf with free bases partly or entirely surrounding the stem.
  • Sessile - a leaf whose blade is attached directly to the stem, lacking a petiole.
  • Petiolate - a leaf attached to the stem by a petiole.
  • Sheathing - with a tubular portion of the leaf blade surrounding the stem below the base.
  • Decurrent - with leaf blade extended downward along the stem, forming vertical lines along the stem.
  • Ochreate - with stipules forming a thin tube around the stem above petiole.
© Tom Lebsack 2018