Isoetales

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Noun1.Isoetales - aquatic or marsh-growing fern allies; known to have existed since the Cenozoic; sometimes included in Lycopodiales
plant order - the order of plants
class Lycopodiate, class Lycopsida, Lycopodiate, Lycopsida - club mosses and related forms: includes Lycopodiales; Isoetales; Selaginellales; and extinct Lepidodendrales; sometimes considered a subdivision of Tracheophyta
family Isoetaceae, Isoetaceae, quillwort family - quillworts; coextensive with the genus Isoetes