Platte River penstemon vs Penstemon cyananthus

Platte River penstemon and Penstemon cyananthus both are nouns.

Word	Noun	Adjective	Verb	Adverb
Platte River penstemon	Yes	No	No	No
Penstemon cyananthus	Yes	No	No	No

As nouns, Platte River penstemon and Penstemon cyananthus are synonyms defined as:

Platte River penstemon and Penstemon cyananthus: erect plant with blue-violet flowers in rings near tips of stems; Idaho to Utah and Wyoming

Platte River penstemon (noun)	Penstemon cyananthus (noun)
erect plant with blue-violet flowers in rings near tips of stems; Idaho to Utah and Wyoming	erect plant with blue-violet flowers in rings near tips of stems; Idaho to Utah and Wyoming