Penstemon rydbergii vs genus Penstemon

Penstemon rydbergii and genus Penstemon both are nouns.

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

Penstemon rydbergii (noun)	genus Penstemon (noun)
plant with whorls of small dark blue-violet flowers; Washington to Wyoming and south to California and Colorado	large genus of subshrubs or herbs having showy blue or purple or red or yellow or white flowers; mostly western North America