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Cross. Gentian, Crossleaf. Gentian or Star Gentian (Gentiana cruciata), an upright perennial gentian found from Europe to Central Asia. It flowers around midsummer and has fairly small flowers in clusters at the stem tips. The common name comes from the way the leaves are arranged in opposite pairs, creating a cross shape when viewed from above. gentiana-2191htm'>Gentiana. Gentianaceae.