genus Caesalpinia vs Caesalpinia

genus Caesalpinia and Caesalpinia both are nouns.

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

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

genus Caesalpinia and Caesalpinia: small spiny tropical trees or shrubs; includes the small genus or subgenus Poinciana

genus Caesalpinia (noun)	Caesalpinia (noun)
small spiny tropical trees or shrubs; includes the small genus or subgenus Poinciana	small spiny tropical trees or shrubs; includes the small genus or subgenus Poinciana