Apiin is a natural flavonoid, a diglycoside of the flavoneapigenin found in the winter-hardy plants parsley[1] and celery,[2] and in banana leaf.[3] The glycoside moiety at carbon-7 of apigenin, O-β-D-apiofuranosyl(→)2-β-D-glucosyl, is carried by several other flavones in parsley plant and seed.[4] The sugar apiose possibly play a role in winter hardiness of celery, duckweed and parsley.[5]
^S. R. Gupta (1952). "A study of apiin from the parsley seeds and plant". Proceedings of the Indian Academy of Sciences, Section A. 35 (5). doi:10.1007/BF03172503. S2CID91953908.