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Isoetes, commonly known as the quillworts, is a genus of plants in the class Isoetopsida and order Isoetales...
Quillworts are mostly aquatic or semi-aquatic in clear ponds and slow-moving streams, though several (e.g. I. butleri, I. histrix and I. nuttallii) grow on wet ground that dries out in the summer...