Oxalis tuberosa vs oxalis

Oxalis tuberosa and oxalis both are nouns.

Word	Noun	Adjective	Verb	Adverb
Oxalis tuberosa	Yes	No	No	No
oxalis	Yes	No	No	No

As nouns, oxalis is a hypernym of Oxalis tuberosa; that is, oxalis is a word with a broader meaning than Oxalis tuberosa:

Oxalis tuberosa: South American wood sorrel cultivated for its edible tubers
oxalis: any plant or flower of the genus Oxalis

Other hypernyms of Oxalis tuberosa include sorrel, wood sorrel.

Oxalis tuberosa (noun)	oxalis (noun)
South American wood sorrel cultivated for its edible tubers	any plant or flower of the genus Oxalis