common foxglove vs foxglove

common foxglove and foxglove both are nouns.

Word	Noun	Adjective	Verb	Adverb
common foxglove	Yes	No	No	No
foxglove	Yes	No	No	No

As nouns, foxglove is a hypernym of common foxglove; that is, foxglove is a word with a broader meaning than common foxglove:

common foxglove: tall leafy European biennial or perennial having spectacular clusters of large tubular pink-purple flowers; leaves yield drug digitalis and are poisonous to livestock
foxglove: any of several plants of the genus Digitalis

Other hypernyms of common foxglove include digitalis.

common foxglove (noun)	foxglove (noun)
tall leafy European biennial or perennial having spectacular clusters of large tubular pink-purple flowers; leaves yield drug digitalis and are poisonous to livestock	any of several plants of the genus Digitalis