genus Corydalis vs genus Corydalus

genus Corydalis and genus Corydalus both are nouns.

Word	Noun	Adjective	Verb	Adverb
genus Corydalis	Yes	No	No	No
genus Corydalus	Yes	No	No	No

As nouns, genus Corydalis and genus Corydalus are synonyms defined as:

Other synonyms of genus Corydalis include Corydalis, Corydalus.

genus Corydalis (noun)	genus Corydalus (noun)
type genus of the Corydalidae	type genus of the Corydalidae
annual or perennial herbs of Himalayan China and South Africa