Isoetes

[n] - type and genus of the Isoetaceae and sole extant genus of the order Isoetales
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Isoetes

Isoetes is a genus of mostly aquatic club-mosses. The plants have very short stems, from which proceed roots and pointed leaves, each of which bears a sporangium. In the stem is a central vascular bundle and outside this a cambium-like layer, which produces new tissue external and internal to itself.
Found on http://www.probertencyclopaedia.com/browse/BI.HTM

Isoetes

Isoetes (sometimes spelled Isoëtes), commonly known as the quillworts, is a genus of plants in the class Isoëtopsida and order Isoëtales. They are lycopods. There are about 140–150 species, with a cosmopolitan distribution but often scarce to rare. Some botanists split the genus, separating two South American species into the genus Stylites, ...
Found on http://en.wikipedia.org/wiki/Isoetes
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