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(Last Modified On 5/31/2013)
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(Last Modified On 5/31/2013)
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Species
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Ipomoea nil (L.) Roth
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PlaceOfPublication
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Cat. 1: 36. 1797.
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Synonym
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Convolvulus nil L., Sp. PI., ed. 2. 219. 1762. LECTOTYPE: U.S.A., illustration of Convolvulus caeruleus hederaceo folio magis anguloso Dill., Hort. Elth. t. 80, fig. 92. 1732.
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Description
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Vines with large trichomes, annual, densely to scattered pubescent throughout. Leaves ovate to suborbicular, 5-15 cm long, entire or 3 (-5) -lobed, basally cordate, the lobes apically acute to acuminate, pubescent. Flowers in 1-5-flowered, often dense cymose clusters of mature and developing buds and flowers, sepals long- lanceolate, 15-25 mm long, with linear-lanceolate apices, densely long-hirsute; corolla blue, purple or almost scarlet, throat often white, 3-5 cm long, the limb 4-5 cm broad. Fruits capsular, subglobose to globose, 8-12 mm in diameter; seeds pyriform, densely pubescent with short trichomes.
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Habit
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Vines
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Note
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Ipomoea nil flowers from December to July.
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Distribution
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pantropical in distribution.
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Note
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This widely cultivated and variable species is often confused with Ipomoea purpurea, I. acuminata, or I. hederacea. Ipomoea acuminata may be separated by its wide and less herbaceous sepals and I. purpurea by its acute to obtuse sepals. There is much less difference between I. nil and I. hederacea. The best way to distinguish them is that the sepals of I. nil are gradually narrowed with the long acute tips suberect, straight, and scarcely spreading. The sepals are more abruptly narrowed and spreading or curved in I. hederacea. I am not fully convinced that these 2 names represent more than one variable species.
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Specimen
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CANAL ZONE: Managre Beach, Tyson et al. 2887 (MO). PANAMA: San Jose Island, Erlanson 476 (US); Johnston 945 (MO). LOS SANTOS: Chitre to Las Tablas, Burch et al. 1214 (MO).
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