Oxalis violacea vs oxalis

Oxalis violacea and oxalis both are nouns.

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

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

Oxalis violacea: perennial herb of eastern North America with palmately compound leaves and usually rose-purple flowers
oxalis: any plant or flower of the genus Oxalis

Other hypernyms of Oxalis violacea include sorrel, wood sorrel.

Oxalis violacea (noun)	oxalis (noun)
perennial herb of eastern North America with palmately compound leaves and usually rose-purple flowers	any plant or flower of the genus Oxalis