Ceratozamia kuesteriana - Cycad - From the Sierra Madre Oriental of NE Mexico, stems hardy to 15º F. with no protection.  Mulch deeply if lower temperatures are expected.

Ceratozamia latifolia - Includes plants called C. microstrobilia & C. sp. 'Tamazunchale') - Cycad - From the Sierra Madre Oriental of NE Mexico, stems hardy to 15º F. with no protection.  Mulch deeply if lower temperatures are expected.

Dioon edule - Chamal - Cycad - From the Sierra Madre Oriental of NE Mexico, stems hardy to 15º F. with no protection.  Mulch deeply if lower temperatures are expected.

Dioon edule var. angustifolium - Chamal - Cycad - From the Sierra Madre Oriental of NE Mexico, stems hardy to 12º F. with no protection.  Mulch deeply if lower temperatures are expected.

Zamia integrifolia - Also sold as Z. floridana - Coontie - Cycad - Hardiest forms come from Florida and adjacent Georgia.

Zamia integrifolia 'Palatka Giant' - Also sold as Z. floridana 'Palatka Giant' - Giant Coontie - Cycad