Abstract:In 1980s, relict living cycad floras were found respectively in Panzhihua of Sichuan and yunnan located in Jinsha River valley of southwest China. The Baoding cycad fossil community is one of living cycad forests of richest Mesozoic fossil floras, the panzhihua cycad forest is the biggest one of living cycad forests in East Asia. The time between these two floras is after an interval of about 200 million years. They appear to have Aome to historical relationship.
The present paper also discusses the origin of panzhihua cycad. The Kam-Yunnania is the important place of orign of Mesozoic cycads. Panzhihua (Baoding) region is very abundant in cycad fossils[6], which are older than those from South China and from othet Eurasian regions. Based on geological records, C. panzhihuaensis might be considered to originate in situ and to be offsprings of the Mesozoic cycads. It is suggested that proper measures should be taken immediately to protect and conserve such endangered species and to bring its consetvarin into line with the Action Plan of IUCN.