Sharply-pointed structure intermediate between a leaflet and a spine, usually green and hence photosynthetic, e.g. as on the rachis of some species of Dioon, Encephalartos, and Macrozamia.
  See also prickle, tooth.

Expanded glossary of Cycad terms . 2014.

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  • spine —   Hard, sharp, non photosynthetic protuberance with vascular connections and not of epidermal origin; the spines on many cycad rachises and sporophylls are actually reduced leaflets.   See also pinnacanth, prickle, tooth …   Expanded glossary of Cycad terms

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