Studies of Neotropical Isoetes L. I. Euphyllum, A New Subgenus

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Abstract
A new subgenus in Isoetes, Euphyllum, is proposed for three extant species and for members of the fossil genus Isoetites. This new subgenus is distinguished from subg. Isoetes by the possession of a number of plesiomorphic characters, including completely alate leaves and the absence of peripheral fibrous bundles. Descriptions and a key to the three modern species [I. gigantea, I. bradei, I. baculata] of Euphyllus are presented.

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