orthostichy

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orthostichy

  1. an imaginary vertical line connecting a row of leaves on a stem.
  2. the possession of parallel cartilaginous rays in the fins of fossil shark-like fish, such as Cladoselache.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005