Synonyms: Allostelites maximum; Equisetum caenosum; Equisetum eburneum (homotypic); Equisetum eburneum var. frondescens (heterotypic); Equisetum eburneum var. serotinum (heterotypic); Equisetum macrostachyon; Equisetum majus; Equisetum majus var. serotinum; Equisetum maximum f. pluviale; Equisetum maximum f. serotinum; Equisetum palustre var. ramulosum; Equisetum telmateia f. breve; Equisetum telmateia f. conforme; Equisetum telmateia f. dactyloideum; Equisetum telmateia f. ramulosum; Equisetum telmateia f. vaucheri; Equisetum telmateia var. conforme; Equisetum telmateia var. pleiostachya (homotypic); Equisetum telmateia var. polystachyum; Equisetum telmateia var. telmateia