Regnellidium diphyllum
Regnellidium diphyllum Lindm.

Regnellidium diphyllum is a species in the Marsileaceae family, native to the Neotropical region, with records in Argentina Northeast, Brazil South, Ohio, and Uruguay. It was first described in 1904 by Lindm.
Description
Regnellidium diphyllum is a member of the Marsileaceae, a family of aquatic ferns. The species is distributed across parts of South and North America, including Argentina Northeast, Brazil South, Ohio, and Uruguay. It was scientifically described in 1904 by the author Lindm. This species is part of the genus Regnellidium, which is known for its aquatic or semi-aquatic growth habit and small, floating or submerged leaves.
Distribution
BR · Neotropical · Argentina Northeast · Brazil South · Ohio · Uruguay