在第三纪，重寄生属植物的祖先偶然寄生在桑寄生科某些植物上，经过几千万年的协同进化，形成了今天比较稳定的寄生与寄主关系。
Their ancestors were parasitic on ancestors of some plants of Loranthaceae by chance during Tertiary. It took them millions of years to form a sturdy relationship between parasites and hosts.
从起源上看， 被子植物的古特有属主要发生于晚白垩纪和早第三纪，地质历史上大都占有广阔的分布区；
The relic genera once occupied huge areas in North Hemisphere in the Tertiary or the late Cretaceous, while neo-endemism was mostly originated in the late Tertiary .
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