genus Samolus vs Samolus

genus Samolus and Samolus both are nouns.

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

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

genus Samolus and Samolus: genus of herbs usually growing in salt marshes: water pimpernels

genus Samolus (noun)	Samolus (noun)
genus of herbs usually growing in salt marshes: water pimpernels	genus of herbs usually growing in salt marshes: water pimpernels