In this study, we analyzed the morphological affinities of the 24 species of Amphitecna based on detailed morphological studies and multivariate cluster analyses. Our results suggest that the genus Amphitecna includes six morphological groups that can be easily distinguished based on floral and fruits characteristics: A. donnell-smithii group, A. macrophylla group, A. megalophylla group, A. molinae group, A. spathicalyx group, and A. steyermarkii group. A new species from Mexico, Amphitecna fonceti, is described. This new species is clearly differentiated by the predominantly ramiflorous inflorescences bearing multiple flowers per shoot, buds rounded at the apex, large flowers with a transverse fold in the corolla throat, calyx surface pubescent and strongly costate, and fruits elliptic, apiculate at the apex. We discuss the characteristics of each morphological group and their geographical distribution, provide a detailed description of the new species including ethnobotany notes, and propose the re-establishment of the giant-leaved species A. megalophylla.

中文翻译：

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Amphitecna（Bignoniaceae）中的分类学更新：墨西哥新种和巨型叶巨型A. phyllophylla的重建

在这项研究中，我们基于详细的形态学研究和多元聚类分析，分析了24种Amphitecna的形态亲和力。我们的研究结果表明，两栖类属包括六个可以根据花和果实特征轻松区分的形态学组：唐氏农杆菌组，大叶农杆菌组，大叶农杆菌组，软体动物组，无核农杆菌组，和A. steyermarkii组。描述了一种来自墨西哥的新物种，Amphitecna fonceti。该新种的明显区别在于主要有花序的花序，每枝有多朵花，芽在先端圆形，在花冠喉中具横向折叠的大花，花萼表面短柔毛，具强肋形，果椭圆形，在先端具尖。