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(Last Modified On 12/18/2012)
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(Last Modified On 12/18/2012)
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Genus
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ROTALA L.
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PlaceOfPublication
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Mant. 175. 1771.
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Synonym
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Suffrenia Bellardi, in Act. Taurin. 7:445. 1794. Boylinia Raf. Aut. Bot. 9. 1817, non Nutt. Winterlia Spreng. Syst. 1:5 19, 788. 1825. Ameletia DC. in MWm. Soc. Phys. Geneve 32:82. 1826. Nimmoia Wight, in Madr. Journ. Sci. 5:311. 1837. Rhyacophila Hochst. in Flora 24:659. 1841. Quartinia EndI. Gen. Suppl. 2:94. 1842. Hydrolythrum Hook. Icon. PI. n. s. 2: t. I007. 1843. Hypobrichia Benth. in Griseb. Cat. PI. Cub. 108. 1886.
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Description
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Aquatic or palustrine herbs, glabrous throughout, simple or sparsely branched. Leaves opposite or verticillate, sessile. Inflorescence of 1-flowered axillary cymes. Flowers usually 3- or 4-merous, bisexual, actinomorphic. Hypanthium appendic- ulate or exappendiculate, generally urceolate, membranaceous, the calyx lobes generally equal, valvate. Petals as many as the calyx lobes or absent. Stamens as many as the calyx lobes or fewer, equal, included, the anthers ovoid or oblong-ovoid, the filaments inserted about one-third from the base of the hypanthium. Ovary 3- or 4-carpellary, sessile or with a short gynophore, 1-locular, the placentation free-central; ovules many; stigma capitate. Fruit a horizontally striate septicidal capsule; style and hypanthium persistent; seeds minute.
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Habit
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herbs
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Note
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About 38 species. America, Europe, Africa and Australia.
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Key
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a. Plants palustrine; leaves and flowers decussate; hypanthium appendic- ulate, 2.5-5.0 mm. long; petals present ..................................................... 1. R. RAMOSIOR aa. Plants aquatic or palustrine; at least the upper leaves and flowers ternate; hypanthium exappendiculate, 0.5-1.0 mm. long; petals absent ..2. R. MEXICANA
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