Equisetum hyemale robustum vs Equisetum hyemale

Equisetum hyemale robustum and Equisetum hyemale both are nouns.

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

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

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

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

Equisetum hyemale 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