Penstemon fruticosus vs lowbush penstemon

Penstemon fruticosus and lowbush penstemon both are nouns.

Word	Noun	Adjective	Verb	Adverb
Penstemon fruticosus	Yes	No	No	No
lowbush penstemon	Yes	No	No	No

As nouns, Penstemon fruticosus and lowbush penstemon are synonyms defined as:

Penstemon fruticosus and lowbush penstemon: low bushy plant with large showy pale lavender or blue-violet flowers in narrow clusters at ends of stems

Other synonyms of Penstemon fruticosus include shrubby penstemon.

Penstemon fruticosus (noun)	lowbush penstemon (noun)
low bushy plant with large showy pale lavender or blue-violet flowers in narrow clusters at ends of stems	low bushy plant with large showy pale lavender or blue-violet flowers in narrow clusters at ends of stems