Apodanthera undulata, common name melon loco, is a plant species native to the south-western United States (western Texas, New Mexico, and Arizona) and in Mexico as far south as Oaxaca.Lady Bird Johnson Wildflower Center, University of Texas at Austin, Native Plant Database
Apodanthera undulata is a monoecious, foul-smelling, perennial vine with a massive taproot up to 20 cm (8 inches) in diameter. Stems are prostrate, running along the ground up to 2.4 m (8 feet), sometimes climbing with tendrils. Leaves are round to kidney-shaped, up to 15 cm (6 inches) across, decidedly wavy. Flowers are yellow, trumpet-shaped. Fruits are egg-shaped with ridges running lengthwise, up to 10 cm (4 inches) long.McVaugh, R. 2001. Cucurbitaceae. 3: 483–652. In R. McVaugh (ed.) Flora Novo-Galiciana. The University of Michigan, Ann Arbor.Gray, Asa. 1853. Plantae Wrightianae, Texano-Neo-Mexicanae, part II. Smithsonian Contributions to Knowledge 5(6):1-119.Correll, D. S. & M. C. Johnston. 1970. Manual of the Vascular Plants of Texas i–xv, 1–1881. The University of Texas at Dallas, Richardson.Lira Saade, R. 2001. Familia Cucurbitaceae. 92: 1–120. In J. Rzedowski & G. Calderón de Rzedowski (eds.) Flora del Bajío. Instituto de Ecología A.C., Pátzcuaro.Shreve, F. & I. L. Wiggins. 1964. Vegetation and Flora of the Sonoran Desert. 2 vols. Stanford University Press, Stanford.
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