Mirabilis tenuiloba common names longlobe four o'clock or maravilla, is a plant species native to the south-western United States and north-eastern Mexico. It has been reported from Baja California, Baja California Sur, southern California (Riverside, San Bernardino, San Diego and Imperial Counties) and Arizona (Pima and Yuma Counties).Flora of North America v 4 p 49, Mirabilis tenuiloba Biota of North America Project, Floristic Synthesis, Mirabilis tenuiloba

Mirabilis tenuiloba is a perennial herb up to 100 cm tall, usually with many glandular hairs. Leaves are broadly egg-shaped, up to 8 cm long and 12 cm across. Flowers are trumpet-shaped or bell-shaped, white or pale pink, up to 18 mm long. Fruits are egg-shaped, dark red-brown, up to 6 mm long.Watson, Sereno. 1882. Proceedings of the American Academy of Arts and Sciences 17: 375.Standley, Paul Carpenter. 1909. Contributions from the United States National Herbarium 12(8): 363.Shreve, F. & I. L. Wiggins. 1964. Vegetation and Flora of the Sonoran Desert 2 vols. Stanford University Press, Stanford.Hickman, J. C. 1993. The Jepson Manual: Higher Plants of California 1–1400. University of California Press, Berkeley.

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