- Combining aspects of shape and distribution, i.e. morphology and geography; recommended species concept for cycads (sensu Walters & Osborne, 2004).
Expanded glossary of Cycad terms . 2014.
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species — (sp.), plural species (spp.). Basic taxonomic rank; taxonomic rank below genus but above subspecies and varietas; a working definition for cycads is “one or more populations where individuals are morphologically similar, interfertile, but… … Expanded glossary of Cycad terms