Cyperus megapotamicus (A. Spreng.) Kunth is a nomenclatural synonym of Rhynchospora megapotamica (A. Spreng.) H. Pfeiff. but was originally misapplied to a species of Cyperus. Contrary to the rules, both species names are in current use in different genera. We here clarify the perpetuated taxonomic and nomenclatural confusion regarding the identity of C. megapotamicus sensu Kunth and related names and conclude that Cyperus jaeggii Boeckeler is the correct name to be adopted. We provide an amended circumscription of this species, with Cyperus mauryi Kuntze and Pycreus nematodes Schrad. ex C. B. Clarke as its newly proposed heterotypic synonyms. Additionally, lectotypes are designated for the names Scirpus megapotamicus A. Spreng., Rhynchospora maculata Maury, Rhynchospora luzuliformis var. elongata Kuntze, Rhynchospora luzuliformis var. subcapitata Kuntze, Cyperus jaeggii, Cyperus mauryi and Pycreus nematodes.

中文翻译：

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巨型香附（Cyperaceae）的分类学同一性和命名法

Cyperus megapotamicus (A. Spreng.) Kunth 是Rhynchospora megapotamica (A. Spreng.) H. Pfeiff的命名同义词。但最初误用一个物种的香附。与规则相反，这两个物种名称目前在不同属中使用。我们在这里澄清关于C. megapotamicus sensu Kunth 和相关名称身份的长期分类和命名混乱，并得出结论，Cyperus jaeggii Boeckeler 是正确的名称。我们提供了该物种的修正范围，包括Cyperus mauryi Kuntze 和Pycreus 线虫施拉德。ex CB Clarke 作为其新提出的异型同义词。此外，选型被指定为Scirpus megapotamicus A. Spreng.、Rhynchospora maculata Maury、Rhynchospora luzuliformis var.。elongata Kuntze, Rhynchospora luzuliformis var. subcapitata Kuntze、Cyperus jaeggii、Cyperus mauryi和Pycreus 线虫。