Part of Speech: Noun

Definition: any bulbous plant belonging to the genus Narcissus, of the amaryllis family, having showy yellow or white flowers with a cup-shaped corona.

Source: Dictionary.com

Found in “Persephone, Falling” by Rita Dove

“ One narcissus among the ordinary beautiful
flowers, one unlike all the others!  She pulled,
” line1/line2

The speaker is saying this specific flower stood out among the other ordinary ones of the same kind that was pulled.