Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
† īăsĭōnē, ēs, f., = ἰασιώνη, a plant bearing a white flower, perhaps bind-weed: Convolvulus sepium, Linn.; Plin. 21, 17, 65, § 105; 22, 22, 39, § 82.