Alpinia officinalis vs Alpinia officinarum

Alpinia officinalis and Alpinia officinarum both are nouns.

Word	Noun	Adjective	Verb	Adverb
Alpinia officinalis	Yes	No	No	No
Alpinia officinarum	Yes	No	No	No

As nouns, Alpinia officinalis and Alpinia officinarum are synonyms defined as:

Alpinia officinalis and Alpinia officinarum: Chinese perennial with pyramidal racemes of white flowers and pungent aromatic roots used medicinally and as flavoring

Other synonyms of Alpinia officinalis include lesser galangal.

Alpinia officinalis (noun)	Alpinia officinarum (noun)
Chinese perennial with pyramidal racemes of white flowers and pungent aromatic roots used medicinally and as flavoring	Chinese perennial with pyramidal racemes of white flowers and pungent aromatic roots used medicinally and as flavoring