A Reconsideration of Stephanospermum
A Reconsideration of Stephanospermum
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DOI：
10.1086/336196
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发表时间：
1963-03
影响因子：
--
通讯作者：
Gilbert A. Leisma;J. Roth
中科院分区：
文献类型：
--
作者：
Gilbert A. Leisma;J. Roth
1. 描述了 Stephanospermum elongatum 的样本，从而产生了有关该种子结构的新数据。牙冠显示为六齿，具有三个主齿和三个次齿。与这些相对应的是三个主支撑和三个次支撑，它们将牙齿连接到珠孔喙。种子具有三个延伸至乳牙的垂直接缝。 2. 有证据表明 S. Stewarti 与 S. elongatum 是同义词。 3. 提出了保留 Stephanospermum 作为一个不同于厚种植物的属的论点，并为 Stephanospermum 的四种已知物种指出了拟议的系统发育序列。
1. Specimens of Stephanospermum elongatum are described that yield new data on the structure of this seed. The crown is shown to be six-toothed, with three primary and three secondary teeth. Corresponding to these are three primary and three secondary buttresses which connect the teeth to the micropylar beak. The seed possesses three vertical seams which extend into the primary teeth. 2. Evidence is advanced for relegating S. stewarti to synonomy with S. elongatum. 3. Arguments are advanced for retaining Stephanospermum as a genus distinct from Pachytesta, and a proposed phylogenetic sequence is indicated for the four known species of Stephanospermum.