quillwort
/ˈkwɪlwɜːt/noun
1- a plant related to the clubmosses, with a dense rosette of long slender leaves, the bases of which contain the spore-producing organs, occurring typically as a submerged aquatic水韭。
1.1
- Genus Isoetes, family Isoetaceae, class Lycopsida.水韭属, 水韭科, 石松纲。