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In Search of the First Flower: A Jurassic Angiosperm, Archaefructus, from Northeast China

机译:寻找第一朵花:来自中国东北的侏罗纪被子植物始祖鸟

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摘要

Angiosperm fruiting axes were discovered from the Upper Jurassic of China. Angiosperms are defined by carpets enclosing ovules, a character demonstrated in this fossil. This feature is lacking in other fossils reported to be earliest angiosperms. The fruits are small follicles formed from conduplicate carpels helically arranged. Adaxial elongate stigmatic crests are conspicuous on each carpel. The basal one-third of the axes bore deciduous organs of uncertain affinities. No scars of subtending floral organs are present to define the individual fertile parts as floral units, but the leaf-like structures subtending each axis define them as flowers. These fruiting axes have primitive characters and characters not considered primitive.
机译:从中国上侏罗世发现了被子植物的结实轴。被子植物是由包裹胚珠的地毯定义的,这种化石表现出这一特征。据报道是最早的被子植物的其他化石缺乏此特征。果实是由螺旋状排列的重复心皮形成的小卵泡。在每个心皮上都明显贴着长条形的凸峰。三分之一的基轴具有不确定亲和力的落叶器官。没有出现可对接的花器官的伤痕,可以将各个可育部分定义为花单元,但是对着每个轴的叶状结构将它们定义为花朵。这些结果轴具有原始字符和不视为原始字符的字符。

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