A new synonym of Lepechinia (Salviinae: Lamiaceae)
A new synonym of Lepechinia (Salviinae: Lamiaceae)
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Lepechinia 的新异名（鼠尾草亚科：唇形科）
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发表时间：
2012
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通讯作者：
Hye
中科院分区：
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作者：
Hye
Chaunostoma Donnell Smith（1895：9）and Lepechinia Willdenow（1804：20，pl. 21)属于唇形科鼠尾草亚族（哈雷等人，2004）。Chaunostoma被称为单型属，仅限于墨西哥南部（恰帕斯州）和危地马拉。然而，Chaunostoma的属划分受到质疑，因为与Lepechinia关系密切，其中包括ca。40种，主要分布于阿根廷至墨西哥和北方加州（Epling 1948）。事实上，Chaunostoma与Lepechinia的区别仅在于茎生花花序和拱形雄蕊（Epling 1948，哈雷et al. 2004）。然而，由于拱形雄蕊也可以在Lepechinia中发现（Epling 1948，步行者& Sytsma 2007），Chaunostoma的属地位在Salviinae中变得越来越成问题。根据最近的系统发育研究，Chaunostoma和Lepechinia被认为是Salviinae内的单系群（Drew & Sytsma 2011）。这两个属的微形态特征支持与分子系统学相同的结论。例如，Chaunostoma和Lepechinia产生双网状花粉粒，而Salviinae的其他成员则具有双网状花粉粒（Moon et al. 2008）。此外，小坚果的蜂窝状脱落疤痕是Chaunostoma和Lepechinia的突触形态条件（Moon et al. 2009）。为此，本文提出了新的同义词和必要的组合。
Chaunostoma Donnell Smith (1895: 9) and Lepechinia Willdenow (1804: 20, pl. 21) belong to the subtribe Salviinae of the Lamiaceae (Harley et al. 2004). Chaunostoma is known as a monotypic genus and is restricted to South Mexico (Chiapas) and Guatemala. However, the generic delimitation of Chaunostoma has been questioned because of the close relationship with Lepechinia , which includes ca. 40 species and is mainly distributed from Argentina to Mexico and Northern California (Epling 1948). In fact, Chaunostoma differs from Lepechinia only by cauliflorous inflorescences and the arched stamens (Epling 1948, Harley et al. 2004). Nevertheless, since the arched stamens can also be found in Lepechinia (Epling 1948, Walker & Sytsma 2007), the generic status of Chaunostoma has become increasingly problematic within Salviinae. Following a recent phylogenetic study, Chaunostoma and Lepechinia are considered together as a monophyletic group within Salviinae (Drew & Sytsma 2011). The micromorphological characteristics of these two genera support the same conclusions as the molecular phylogeny. For example, Chaunostoma and Lepechinia produce perforate pollen grains while the other members of Salviinae possess bireticulate pollen grains (Moon et al. 2008). Moreover the areolate abscission scar of the nutlets is a synapomorphic condition for Chaunostoma and Lepechinia (Moon et al. 2009). Therefore, the new synonym and the necessary combination are proposed here.