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Genus Isoetes in Family Isoetaceae

In botanical taxonomy, a genus (plural genera) is a rank used to group closely related species within a family. In the hierarchy, genus sits below family and above species.

Genera are defined by shared morphological, anatomical, and genetic characteristics (for example, features of flowers, fruits, seeds, or leaves) that indicate a close evolutionary relationship among the species they contain.

Each genus can include one or more species. Examples include Rosa (roses) and Solanum (nightshades, including tomato and eggplant).

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Genus Description

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Isoetes (family Isoetaceae) is a cosmopolitan genus of heterosporous lycophytes containing approximately 350–380 accepted species worldwide. Its members inhabit freshwater environments ranging from low‑land ponds to high‑altitude lakes on all continents except Antarctica, with the highest richness in temperate regions of North America, Eurasia, and the Southern Hemisphere. The type species is Isoetes lacustris (L.) L., designated by Linnaeus (POWO, 2024; WFO, 2024).

Plants are perennial, rosette‑forming herbs that arise from a compact corm and bear a dense tuft of unbranched, cylindrical leaves that may reach 30 cm. Each leaf bears a single basally situated sporangium hidden beneath a membranous indusium, and a small ligule occurs near the leaf base. The genus is heterosporous: megaspores are relatively large (0.5–1 mm) with a reticulate surface, while microspores are minute (

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