Penstemon linarioides vs narrow-leaf penstemon

Penstemon linarioides and narrow-leaf penstemon both are nouns.

Word	Noun	Adjective	Verb	Adverb
Penstemon linarioides	Yes	No	No	No
narrow-leaf penstemon	Yes	No	No	No

As nouns, Penstemon linarioides and narrow-leaf penstemon are synonyms defined as:

Penstemon linarioides and narrow-leaf penstemon: plant having small narrow leaves and blue-violet flowers in long open clusters; Utah and Colorado to New Mexico and Arizona

Penstemon linarioides (noun)	narrow-leaf penstemon (noun)
plant having small narrow leaves and blue-violet flowers in long open clusters; Utah and Colorado to New Mexico and Arizona	plant having small narrow leaves and blue-violet flowers in long open clusters; Utah and Colorado to New Mexico and Arizona