genus Penstemon vs Penstemon serrulatus

genus Penstemon and Penstemon serrulatus both are nouns.

Word	Noun	Adjective	Verb	Adverb
genus Penstemon	Yes	No	No	No
Penstemon serrulatus	Yes	No	No	No

genus Penstemon (noun)	Penstemon serrulatus (noun)
large genus of subshrubs or herbs having showy blue or purple or red or yellow or white flowers; mostly western North America	whorls of deep blue to dark purple flowers at tips of erect leafy stems; moist places from British Columbia to Oregon