422.11.00 IsoetaceaeName: Isoëtales;
Isoetanae.
English: Quillworts; Scale trees.
Member: 1 genus, Isoëtes; ± 150 species.
Synonym: Calamaria; Cephaloceraton; Isoetella; Sivetes; Stylites; Subularia.
BotanyFern; cosmopolitan; rare; aquatic or semi-aquatic.
Leaves: slender; broadens downward to a swollen base, in clusters.
Root: a corm, bulb-like, underground; heterosporous.
TaxonomyIsoetes has many extinct and fossil species, from Carboniferous and Triassic era.