Equisetum robustum vs Equisetum hyemale

Equisetum robustum and Equisetum hyemale both are nouns.

Word	Noun	Adjective	Verb	Adverb
Equisetum robustum	Yes	No	No	No
Equisetum hyemale	Yes	No	No	No

As nouns, Equisetum robustum and Equisetum hyemale are synonyms defined as:

Equisetum robustum and Equisetum hyemale: evergreen erect horsetail with rough-edged stems; formerly used for scouring utensils

Other synonyms of Equisetum robustum include Equisetum hyemale robustum, rough horsetail, scouring rush.

Equisetum robustum (noun)	Equisetum hyemale (noun)
evergreen erect horsetail with rough-edged stems; formerly used for scouring utensils	evergreen erect horsetail with rough-edged stems; formerly used for scouring utensils