Penstemon fruticosus vs Penstemon

Penstemon fruticosus and Penstemon both are nouns.

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

Penstemon fruticosus (noun)	Penstemon (noun)
low bushy plant with large showy pale lavender or blue-violet flowers in narrow clusters at ends of stems	large genus of subshrubs or herbs having showy blue or purple or red or yellow or white flowers; mostly western North America