Youngia thunbergiana (Crepidinae, Cichorieae, Asteraceae), a Species Overlooked in the North American Flora
Youngia thunbergiana (Crepidinae, Cichorieae, Asteraceae), a Species Overlooked in the North American Flora
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DOI：
10.2179/13-018
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发表时间：
2013-12-01
期刊：
影响因子：
0.4
通讯作者：
Neubig, Kurt M.
中科院分区：
文献类型：
--
作者：
Urbatsch, Lowell E.;Pruski, John F.;Neubig, Kurt M.
据记载，北美洲的黄杨木产自阿拉巴马州、佐治亚州、马里兰州、弗吉尼亚州和南卡罗来纳州。劳埃德·辛纳斯 (Lloyd Shinners) 于 1964 年在哥伦比亚特区和北卡罗来纳州报告了该物种，但后来的调查人员显然忽视了这一事实。当识别时，该分类单元通常被视为 Youngia japonica subsp。 elstonii，基于来自夏威夷的标本，根据 Babcock 和 Stebbins 的 Youngia 专着（1937 年）。随后，当未获得分类学认可时，它被视为Y. japonica多态性复合体的同义词。 Shinners 提供了特定等级认可的证据，因此断言 Y. thunbergiana 是其正确名称。目前的研究与他对辛纳斯的发现是一致的。 Youngia pseudosenecio 是随后在 Y. japonica 复合体中提出的另一个名称，已与 Y. japonica subsp. 同义。埃尔斯托尼。核 ITS 序列数据支持 Y.pseudosenecio 和 Y.thunbergiana 是同一物种，并且该实体代表与 Y.japonica 不同的谱系。
Youngia thunbergiana is documented for North America from Alabama, Georgia, Maryland, Virginia, and South Carolina. Lloyd Shinners in 1964 reported this species for the District of Columbia and North Carolina, a fact apparently overlooked by subsequent investigators. When recognized, this taxon was generally treated as Youngia japonica subsp. elstonii, based on specimens from Hawaii, in accordance with the monograph of Youngia by Babcock and Stebbins (1937). Subsequently, when not accorded taxonomic recognition, it has been regarded as a synonym of the Y. japonica polymorphic complex. Shinners presented evidence for recognition at specific rank and, as such, asserted that Y. thunbergiana is its correct name. The present research is in agreement with his findings of Shinners. Youngia pseudosenecio is another name subsequently proposed within the Y. japonica complex that has been synonymized with Y. japonica subsp. elstonii. Nuclear ITS sequence data lend support to Y. pseudosenecio and Y. thunbergiana being the same species and that this entity represents a lineage distinct from Y. japonica.