Equisetum hyemale vs Equisetum hyemale robustum

Equisetum hyemale and Equisetum hyemale robustum both are nouns.

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

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

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

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

Equisetum hyemale (noun)	Equisetum hyemale robustum (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