Find the word definition

Wiktionary
phytonym

n. 1 The name of a plant 2 An anthroponym derived from the name of a plant

Wikipedia
Phytonym

A phytonym (< Greek phuto-<phuton, "plant" + Greek onuma, "name") is a plant name. Phytonymy should not be confused with phytonomy, which studies the origin and growth of plants.