Siberian larch vs Larix russica

Siberian larch and Larix russica both are nouns.

Word	Noun	Adjective	Verb	Adverb
Siberian larch	Yes	No	No	No
Larix russica	Yes	No	No	No

As nouns, Siberian larch and Larix russica are synonyms defined as:

Siberian larch and Larix russica: medium-sized larch of northeastern Russia and Siberia having narrowly conic crown and soft narrow bright-green leaves; used in cultivation

Other synonyms of Siberian larch include Larix siberica.

Siberian larch (noun)	Larix russica (noun)
medium-sized larch of northeastern Russia and Siberia having narrowly conic crown and soft narrow bright-green leaves; used in cultivation	medium-sized larch of northeastern Russia and Siberia having narrowly conic crown and soft narrow bright-green leaves; used in cultivation