Sedum telephium vs sedum

Sedum telephium and sedum both are nouns.

Word	Noun	Adjective	Verb	Adverb
Sedum telephium	Yes	No	No	No
sedum	Yes	No	No	No

As nouns, sedum is a hypernym of Sedum telephium; that is, sedum is a word with a broader meaning than Sedum telephium:

Sedum telephium: perennial northern temperate plant with toothed leaves and heads of small purplish-white flowers
sedum: any of various plants of the genus Sedum

Sedum telephium (noun)	sedum (noun)
perennial northern temperate plant with toothed leaves and heads of small purplish-white flowers	any of various plants of the genus Sedum