Hymenoxys tweediei is a South American species of flowering plant in the daisy family. It has been found mostly in Uruguay with a few populations in northeastern Argentina (Entre Rios Province) and southern Brazil (Rio Grande do Sul).Kittie Lucille Fenley Parker. 1962. South American Species of Hymenoxys (Compositae). Leaflets of Western Botany 9: 197-224 descriptions in Latin and English, commentary in English, pages 202-203Kittie Lucille Fenley Parker. 1962. South American Species of Hymenoxys (Compositae). Leaflets of Western Botany 9: Plate 1 distribution map; key to symbols on page 200Kittie Lucille Fenley Parker. 1962. South American Species of Hymenoxys (Compositae). Leaflets of Western Botany 9: Plates 2 + 3 line drawings; captions on page 200
Hymenoxys tweediei is a succulent annual up to tall. Leaves are divided in thin, narrow segments. Flower heads each contain 135-196 disc flowers and 7-9 ray flowers.Hooker, William Jackson Arnott, George Arnott Walker 1841. Journal of Botany, being a second series of the Botanical Miscellany 3: 323
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