Physostegia virginiana vs obedient plant

Physostegia virginiana and obedient plant both are nouns.

Word	Noun	Adjective	Verb	Adverb
Physostegia virginiana	Yes	No	No	No
obedient plant	Yes	No	No	No

As nouns, Physostegia virginiana and obedient plant are synonyms defined as:

Physostegia virginiana and obedient plant: North American plant having a spike of two-lipped pink or white flowers

Other synonyms of Physostegia virginiana include false dragon head, false dragonhead.

Physostegia virginiana (noun)	obedient plant (noun)
North American plant having a spike of two-lipped pink or white flowers	North American plant having a spike of two-lipped pink or white flowers