cycads

They expected to find evidence of well - known Late Cretaceous vegetation such as conifers and cycads.

他们原本期望发现晚白垩世时期著名植物如针叶树和苏铁存在的证据.

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There are four widely different living groups: the cycads , ginkgo, conifers , gnetophytes, and several fossil groups.

分为四个不同的类群: 苏铁类 、 银杏类 、 松柏类、买麻藤类植物以及一些化石类群.

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