In Ceratozamia the broad petiole-base is characterized by the presence of two lateral spinous processes, suggesting stipular appendages, comparable, on a reduced scale, with the large stipules of the Marattiaceae among Ferns.
2
The leaf-base shows indications of stipular outgrowths.
3
They climb by means of tendrils, which are stipular structures arising from the leaf-sheath.