botanical (adj.)

"pertaining to the science or study of plants," 1650s, from French botanique (17c.) or directly from Medieval Latin botanicus, from Greek botanikos "of herbs," from botane "a plant, grass, pasture, fodder." The Greek words seems to have more to do with pasturage than plants; compare related botamia "pastures, meadows," boter "herdsman," boton "grazing beast."

suffix forming adjectives from nouns or other adjectives, "of, like, related to, pertaining to," Middle English -al, -el, from French or directly from Latin -alis (see -al (2)).