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(Last Modified On 5/31/2013)
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(Last Modified On 5/31/2013)
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Genus
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Operculina S. Manso
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PlaceOfPublication
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Enum. Subst. Bras. 16. 1836.
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Note
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TYPE: 0. convolvulus S. Manso.
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Description
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Lianas to small herbaceous vines, the stems, petioles, and pedicels often winged. Leaves entire to lobed, often cordate. Flowers axillary, in few-flowered cymes or solitary; sepals large, glabrous, enlarging in fruit and becoming cori- aceous, often irregularly erose on the margins; corolla large, broadly campanulate, funnelform, or salverform, white, yellow, or reddish; stamens included, the anthers twisted at least in age, the pollen 3-colpate; ovary glabrous, bilocular, each locule bi-ovulate, the style included, filiform, the stigma biglobose. Fruits de- hiscent at or above the middle by a circumscissile epicarp, the upper part more or less fleshy and separating from the lower part and from the endocarp, 2- locular, 4-seeded; the seeds glabrous or pubescent.
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Habit
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Lianas to small herbaceous vines
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Note
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A tropical genus of 15-20 species. House (1906) did the last critical study of the North American species. Many of the species included by House are now placed in Merremia.
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Reference
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House, H. D. Studies in the North American Convolvulaceae II. The genus Operculina. Bull. Torrey Bot. Club 33: 495-503. 1906.
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Key
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a. Peduncles and sometimes stems conspicuously winged; corollas yellow ...... 3. 0. triquietra aa. Peduncles and stems without wings; corollas white, pink to red. b. Leaves 3-8 cm long; sepals to 2.5 cm long; corollas to 7 cm long, pink to red ...... 2. 0. pteripes bb. Leaves 8-15 cm long, sepals 2.5-3 cm long; corolla to 9 cm long, white or lilac ...... 1. 0. codonantha
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