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(Last Modified On 1/11/2013)
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(Last Modified On 1/11/2013)
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Genus
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LUDWIGIA L.
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PlaceOfPublication
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Gen. P1., ed. 5, 55. 1754.
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Synonym
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Isnardia L., Gen. P1., ed. 5, 56. 1754.
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Description
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Mostly perennial herbs with opposite or alternate leaves and solitary axillary flowers or, by reduction of upper leaves, terminal spikes or heads. Flowers normally 4-merous, the stamens as many as the sepals and with relatively short filaments. Petals often small or wanting; if conspicuous, usually early deciduous. Floral tube not prolonged beyond the ovary. Bracteoles lacking to quite well developed. Sepals persistent; summit of ovary truncate or flattish, or crowned with pyramidal to depressed persistent 4-lobed base of style (stylopodium); style short; stigma capitate to somewhat 4-lobed. Capsule subspheric to obpyramidal, elongate, angled or subterete, dehiscing by a terminal pore or longitudinally. Seeds many, naked with evident raphe and multiseriate in each cell, or rarely enclosed in endo- carp and uniseriate.
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Habit
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herb
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Distribution
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A genus of ca. 35 species of wet warm places in Old and New Worlds.
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Key
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a. Petals lacking or minute; leaves petioled; floating or creeping plants ....... 1. L. PALUSTRIS aa. Petals conspicuous; leaves subsessile; plants decumbent or ascending. 2. L. VERTICILLATA
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