Types of leaves and leaflets. A Linear petiole and rachis with clustered leaflets B Twisted petioles and rachis, with opposite to subopposite leaflets.

 
 
  Part of: Martínez-Domínguez L, Nicolalde-Morejón F, Vergara-Silva F, Stevenson DWm (2018) Taxonomic review of Ceratozamia (Zamiaceae) in the Sierra Madre Oriental, Mexico. PhytoKeys 100: 91-124. https://doi.org/10.3897/phytokeys.100.23152