blue-eyed Mary vs Collinsia verna

blue-eyed Mary and Collinsia verna both are nouns.

Word	Noun	Adjective	Verb	Adverb
blue-eyed Mary	Yes	No	No	No
Collinsia verna	Yes	No	No	No

As nouns, blue-eyed Mary and Collinsia verna are synonyms defined as:

blue-eyed Mary and Collinsia verna: eastern United States plant with whorls of blue-and-white flowers

blue-eyed Mary (noun)	Collinsia verna (noun)
eastern United States plant with whorls of blue-and-white flowers	eastern United States plant with whorls of blue-and-white flowers