与石松科同延的低等脉管植物;在某些分类中,包含卷柏目和水韭目。
Lower vascular plants coextensive with the family Lycopodiaceae ; in some classifications includes the Selaginellaceae and Isoetaceae .
水韭科的模式属,水韭目唯一现存的一个属。
Type and genus of the Isoetaceae and sole extant genus of the order Isoetales .