Penstemon serrulatus vs cascade penstemon

Penstemon serrulatus and cascade penstemon both are nouns.

Word	Noun	Adjective	Verb	Adverb
Penstemon serrulatus	Yes	No	No	No
cascade penstemon	Yes	No	No	No

As nouns, Penstemon serrulatus and cascade penstemon are synonyms defined as:

Penstemon serrulatus and cascade penstemon: whorls of deep blue to dark purple flowers at tips of erect leafy stems; moist places from British Columbia to Oregon

Penstemon serrulatus (noun)	cascade penstemon (noun)
whorls of deep blue to dark purple flowers at tips of erect leafy stems; moist places from British Columbia to Oregon	whorls of deep blue to dark purple flowers at tips of erect leafy stems; moist places from British Columbia to Oregon