Didymopanax had been recognized for at least a century as the only genus of Araliaceae in the Americas with bicarpellate ovaries, but in recent decades, it had been treated in synonymy under Schefflera, where it has been recognized as an informal group. During this time, several new species belonging to the group were described under Schefflera, but there has been a growing understanding over the past 15 years that this broadly defined genus is polyphyletic, comprising five non-sister clades. The Neotropical species form a monophyletic group, but its five major subclades are both morphologically and geographically coherent, and are therefore being recognized as distinct genera. As a result, Crepinella Marchal and Sciodaphyllum P. Browne have been reinstated (but with new circumscriptions), and the remaining subclades will be accommodated in two new genera. Here we resurrect Didymopanax, transferring the 37 species out of Schefflera. As now defined, Didymopanax includes species with bicarpellate as well as a few with 5–6-carpellate ovaries, mostly from the rainforests and open savannic vegetations of Brazil. Twenty-one new combinations are proposed for taxa originally described under Panax L. (1), Schefflera (19), or Sciodaphyllum (1).

中文翻译：

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新热带五加科研究。三、新世界属 Didymopanax Decne 的复活。& Planch.，以前包括在鹅掌楸（五加科）

至少一个世纪以来，Didymopanax 一直被认为是美洲唯一具有双心皮卵巢的五加科属，但最近几十年，它在 Schefflera 下被视为同义词，在那里它被认为是一个非正式的群体。在此期间，属于该组的几个新物种被描述为鹅掌楸属，但在过去的 15 年中，人们越来越了解这个广义定义的属是多系的，包括五个非姐妹进化枝。新热带物种形成一个单系群，但它的五个主要分支在形态和地理上都是一致的，因此被认为是不同的属。因此，Crepinella Marchal 和 Sciodaphyllum P. Browne 已恢复（但有新的限制），其余的子分支将被归入两个新属。在这里，我们复活了 Didymopanax，将 37 个物种从鹅掌楸中转移出来。按照现在的定义，Didymopanax 包括具有双心皮的物种以及一些具有 5-6 心皮子房的物种，主要来自巴西的热带雨林和开阔的热带草原植被。为最初在 Panax L. (1)、Schefflera (19) 或 Sciodaphyllum (1) 下描述的分类群提出了 21 种新组合。