sessile trillium vs trillium

sessile trillium and trillium both are nouns.

Word	Noun	Adjective	Verb	Adverb
sessile trillium	Yes	No	No	No
trillium	Yes	No	No	No

As nouns, trillium is a hypernym of sessile trillium; that is, trillium is a word with a broader meaning than sessile trillium:

sessile trillium: trillium of northeastern United States with sessile leaves and red or purple flowers having a pungent odor
trillium: any liliaceous plant of the genus Trillium having a whorl of three leaves at the top of the stem with a single three-petaled flower

Other hypernyms of sessile trillium include wake-robin, wood lily.

sessile trillium (noun)	trillium (noun)
trillium of northeastern United States with sessile leaves and red or purple flowers having a pungent odor	any liliaceous plant of the genus Trillium having a whorl of three leaves at the top of the stem with a single three-petaled flower