Corydalis vs Corydalus

Corydalis and Corydalus both are nouns.

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

As nouns, Corydalis and Corydalus are synonyms defined as:

Other synonyms of Corydalis include genus Corydalis, genus Corydalus.

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