Erica lusitanica vs erica

Erica lusitanica and erica both are nouns.

Word	Noun	Adjective	Verb	Adverb
Erica lusitanica	Yes	No	No	No
erica	Yes	No	No	No

As nouns, erica is a hypernym of Erica lusitanica; that is, erica is a word with a broader meaning than Erica lusitanica:

Erica lusitanica: erect dense shrub native to western Iberian peninsula having profuse white or pink flowers; naturalized in southwestern England
erica: any plant of the genus Erica

Other hypernyms of Erica lusitanica include true heath.

Erica lusitanica (noun)	erica (noun)
erect dense shrub native to western Iberian peninsula having profuse white or pink flowers; naturalized in southwestern England	any plant of the genus Erica