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Quillworts are plants of the genus Isoetes and Stylites, in the family Isoetaceae, in the order Isoetales. This order is sometimes placed in the class Isoetopsida, sometimes in the Selaginellopsida or Lycopsida. They are considered " fern allies".Quillworts are mostly aquatic or semi-aquatic. They feature reed-like or quill-like erect leaves arising from a central corm. They are heterosporous.
Quillwort species are very difficult to distinguish by general appearance. The best way to identify them is by examing the megaspores under a microscope.
The name quillwort is also used for plants of the genus Acorus.
