Cycadales
Name: Cycadales.
English: Cycads.
Botany
Root: with N2-fixing cyanobacteria.
Stem: pachycaulous.
Leaves: dioecious; pinnate megaphylls.
Reproduction: zooidogamy; males with pollen cones; pollen tube simple.
Taxonomy
Cycadales is an Order in Gymnospermae.
In the Plant theory Cycadales is placed in the Class Cycadidae in the Gymnospermae. Cycadales has 2 families and 10 genera.
Cycadaceae: Cycas.
Zamiaceae: Ceratozamia, Dioon, Encephalartos, Lepidozamia, Macrozamia, Microcycas, Stangeria, Zamia.