Equisetum

**Definition:** The only living genus of the order Equisetales, class Equisetopsida (Sphenopsida), division Equisetophyta (Sphenophyta); distantly related to ferns. It grows in moist places. The hollow, jointed, ridged stems contain SILICATES.

**Tree numbers:** - B01.875.800.575.175

**Synonyms:** - Horsetail