since the Jurassic epoch, though the timing of the origin of modern Isoetes is subject to considerable uncertainty.

The name of the genus may also be spelled Isoëtes. The diaeresis (two dots over the e) indicates that the o and the e are to be pronounced in two distinct syllables. Including this in print is optional; either spelling (Isoetes or Isoëtes) is correct.

Description

Quillworts are mostly aquatic or semi-aquatic in clear ponds

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