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(Last Modified On 1/14/2013)
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(Last Modified On 1/14/2013)
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Species
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POLYGONUM CONVOLVULUS L.
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PlaceOfPublication
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Sp. Pl. 364. 1753.
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Description
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Clambering or twining glabrous or scurfy annuals. Leaves inconspicuously punctate, often scurfy on the veins below, entire but strigillose on the margins, apically acute or attenuate, the bases not decurrent on the petioles; blades cordate, 1-6 cm. long, 0.5-5 cm. broad; ochreae 2-4 mm. long, fragile, usually eciliate. Inflorescences of axillary lax leafy racemes or panicles, the peduncles and rhachises scurfy, the flowers loosely fasciculate in mostly eciliate ochreolae 1-2 mm. long. Flowers greenish, the pedicels distally articulated and ultimately exceeding the ochreolae by 1-2 mm.; tepals 5, subequal, connate for about half their length, 3-4 mm. long; stamens 8, discrete, adnate for half their length to the tepals; filaments about 1.5 mm. long; anthers less than 0.5 mm. in diameter, subrotund; ovary trigonous; styles 3, connate, capped by a 3-lobate stigma, about 0.5 mm. long. Achenes triquetrous, with ovate facies, scarcely beaked, dull, black, granular, 3-4 mm. long.
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Distribution
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CHIRIQUI: Cerro Punta, ca. 6025 ft., P. White I98. This weedy species, naturalized from Europe, is quite common in temperate North America, but seems to be rather rare in Central and South America.
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Specimen
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CHIRIQUI: Cerro Punta, ca. 6025 ft., P. White I98.
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Note
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The cited specimen is the only P. convolvulus from Central and South America in the herbarium of the Missouri Botanical Garden. The section ECHINOCAULON Small is represented in Central America by P. meissnerianum Cham. & Schlecht., which differs from all the aforementioned in having clambering armed stems and glandular dichotomous few-flowered cymes and triquetrous achenes. In the Caribbean region it is found in Mexico, Guate- mala, Salvador, Costa Rica and the West Indies but has not yet been collected in Panama. It ranges from the southeastern United States to Brazil. Joinsson 167 from Parana' in Brazil, labeled as P. meissnerianurn, is P. arifolijun L., probably not previously reported from Brazil or even from South America.
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