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Geranium biuncinatum is a pubescent annual plant with erect or ascending stems. Leaves long-petiolate with orbicular, palmatipartite, blades, that are usually 5-lobed into obovate pubescent lobes. Flowers are mauve with a dark centre and arranged in 1-3-flowered, glandular-pilose inflorescence. Mericarps are glabrous with 2 conspicuous recurved beaks.