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Leaves and fruit. Copyright CSIRO
Fruit, several views, cross section and seed. Copyright W. T. Cooper
Cotyledon stage, epigeal germination. Copyright CSIRO
Scale bar 10mm. Copyright CSIRO
10th leaf stage. Copyright CSIRO
Zanthoxylum ovalifolium Wight
Wight, R. (1839) Illustrations of Indian Botany 1: 169. Type: India, Madras, Wight 356.
Zanthoxylum inerme C.T.White & W.D.Francis, Queensland Department of Agriculture and Stock. Botany Bulletin 22: 6(1920), Type: Near Atherton, C.T. White (type); [given by T.G.Hartley, J. Arnold Arbor. 47 (1966) 207 as White, January, 1918, A Zanthoxylum dominianum Merr. & L.M.Perry, Journal of the Arnold Arboretum 22: 32(1941), Type: Based on Fagara varians Domin. Zanthoxylum suberosum C.T.White, Proceedings of the Royal Society of Queensland 53: 208(1942), Type: Based on Zanthoxylum inerme. Fagara varians Domin, Biblioth. Bot. 22: 846(1927), Type: Queensland, Lake Eacham, Feb. 1910, Domin 5657; holo: PR.
Thorny Yellowwood; Oval-leaf Yellow Wood; Little Yellowwood
Oil dots quite large, numerous and conspicuous. Both simple and compound leaves usually present on each twig. Leaf or leaflet blades about 6-16.5 x 2.5-7 cm. Lateral veins forming loops inside the blade margin and midrib generally raised on the upper surface of the leaflet blade.
Inflorescence about 3-12 cm long, approximating but usually not exceeding the leaves. Sepals about 1 mm long. Petals about 2.5 mm long. Anther filaments about 2 mm long, inserted outside the sometimes inconspicuous disk, anthers about 0.75 mm long. Disk about 0.5-0.75 mm high. Carpels about 1.5 mm long, style eccentric.
Cotyledons elliptic or obovate, about 4-7 mm long, fleshy, without venation. Oil dots large. First pair of leaves with toothed leaflets. Petiole winged. At the tenth leaf stage: leaflet blades elliptic to obovate, apex acuminate, base cuneate often unequal-sided, upper surface glabrous, sometimes with 1 or 2 straight spines on the midrib; oil dots large, easily visible with a lens; petiole usually with one to several spines on the upper surface. Spines also present on the stem and on the flattened upper surface of the compound leaf rhachis.
Distribution and Ecology
Food plant for the larval stages of the Ambrose Butterfly. Common & Waterhouse (1981).
Shrub (woody or herbaceous, 1-6 m tall)