genus Lewisia vs Lewisia

genus Lewisia and Lewisia both are nouns.

Word	Noun	Adjective	Verb	Adverb
genus Lewisia	Yes	No	No	No
Lewisia	Yes	No	No	No

As nouns, genus Lewisia and Lewisia are synonyms defined as:

genus Lewisia and Lewisia: genus of western North American low-growing herbs having linear woolly leaves and large pink flowers

genus Lewisia (noun)	Lewisia (noun)
genus of western North American low-growing herbs having linear woolly leaves and large pink flowers	genus of western North American low-growing herbs having linear woolly leaves and large pink flowers