Romneya coulteri vs California tree poppy

Romneya coulteri and California tree poppy both are nouns.

Word	Noun	Adjective	Verb	Adverb
Romneya coulteri	Yes	No	No	No
California tree poppy	Yes	No	No	No

As nouns, Romneya coulteri and California tree poppy are synonyms defined as:

Romneya coulteri and California tree poppy: tall branching subshrub of California and Mexico often cultivated for its silvery-blue foliage and large fragrant white flowers

Other synonyms of Romneya coulteri include matilija poppy.

Romneya coulteri (noun)	California tree poppy (noun)
tall branching subshrub of California and Mexico often cultivated for its silvery-blue foliage and large fragrant white flowers	tall branching subshrub of California and Mexico often cultivated for its silvery-blue foliage and large fragrant white flowers