Fagus sylvatica purpurea vs Fagus purpurea

Fagus sylvatica purpurea and Fagus purpurea both are nouns.

Word	Noun	Adjective	Verb	Adverb
Fagus sylvatica purpurea	Yes	No	No	No
Fagus purpurea	Yes	No	No	No

As nouns, Fagus sylvatica purpurea and Fagus purpurea are synonyms defined as:

Fagus sylvatica purpurea and Fagus purpurea: variety of European beech with shining purple or copper-colored leaves

Other synonyms of Fagus sylvatica purpurea include copper beech, Fagus sylvatica atropunicea, purple beech.

Fagus sylvatica purpurea (noun)	Fagus purpurea (noun)
variety of European beech with shining purple or copper-colored leaves	variety of European beech with shining purple or copper-colored leaves