Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
spĭŏnĭa, ae, f., a kind of grape-vine, Col. 3, 2, 27; 3, 7, 1; 3, 21, 3: vitis, Plin. 14, 2, 4, § 34.