https://www.merriam-webster.com/dictionary/yellow%20daylily
YELLOW DAYLILY Definition & Meaning - Merriam-Webster
The meaning of YELLOW DAYLILY is any of various daylilies having yellow flowers; especially : an Asian daylily (Hemerocallis lilioasphodelus synonym H. flava)...
yellow daylilydefinitionmeaningmerriamwebster
https://www.rhs.org.uk/plants/92888/hemerocallis-fulva-flore-pleno-(d)/details
Hemerocallis fulva 'Flore Pleno' (d) | double yellow daylily Herbaceous Perennial/RHS
hemerocallis fulvaflore plenoyellow daylilyherbaceous perennial