Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
† ĕrysiscēptrum, i, n., = ἐρυσίσκηπτρον, a low thorny shrub, also called adipsatheon, Plin. 24, 13, 69, § 112 al.; App. Herb. 109.