Penstemon fruticosus vs shrubby penstemon

Penstemon fruticosus and shrubby penstemon both are nouns.

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

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

Penstemon fruticosus and shrubby 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 lowbush penstemon.

Penstemon fruticosus (noun)	shrubby 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