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(Last Modified On 8/14/2013)
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(Last Modified On 8/14/2013)
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Species
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Bacopa repens (Sw.) Wettst.
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PlaceOfPublication
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Engl. & Prantl., Nat. Pflanzenfam. IV 3b: 76. 1895.
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Synonym
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Gratiola repens Sw., Prodr. Veg. Ind. Occ. 14. 1788. TYPE: Jamaica, Swartz (not seen). Herpestis repens (Sw.) Schlecht. & Cham., Linnaea 5: 107. 1830. Macuillamia limosa Pennell, Proc. Acad. Nat. Sci. Philadelphia 72: 158. 1920. TYPE: Colombia, Pennell 2927 (NY, US). Bacopa limosa (Penn.) Standley, Contr. U.S. Natl. Herb. 27: 336. 1928. Macuillamia repens (Sw.) Pennell, Acad. Nat. Sci. Philadelphia Monogr. 1: 60. 1935.
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Description
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Aquatic or paludal herbs, stems stout but weak and prostrate, fistulose, drying flat, pubescent with spreading white hairs, glabrescent; roots fibrous, sometimes rooting at the nodes. Leaves obovate, elliptical or orbicular, apically obtuse or round, basally cuneate or slightly clasping, to 20 mm long, 15 mm wide, palmately many nerved, glabrous or pubescent, the margins entire or somewhat sinuate. Inflorescences 1(-3) flowers in the leaf axils, the peduncles slender, pilose, ca. 8 mm long, slightly longer in fruit, terete or drying angled, ebracteate. Flowers with 4-5 free sepals, the outer 2 sepals 2.5 mm long, 1.5 mm wide, entire, oblong, apically blunt acute, basally narrowed, nervose, glabrate or pilose, sometimes ciliate, the inner 2 sepals narrower, thin costate, ciliolate, shorter than the outer sepals; corolla white, the throat ?yellow, 3 mm long; stamens 4, the filaments glabrous, inserted at the top of the corolla tube, the anthers dark, broadly ellipsoidal, ca. 0.7 mm long, the thecae proximal; ovary glabrous, the style apically furcate, the stigmas 2-lobed, peltate, the style basally tapering gradually into the ovary, the style 1 mm long. Capsule globose, ca. 2 mm long, partly enclosed by the accrescent sepals, the sepals becoming 3-4 mm long.
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Habit
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herbs
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Note
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This species may be recognized by its glabrescent stems, rotund leaves and small flowers and fruits. The only other Panamanian species of Bacopa with rotund leaves, B. salzmannii, has conspicuously pilose stems and much larger fruits.
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Distribution
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found in swamps and other wet places in lowland Panama. It ranges from southern Mexico into South America and the Antilles
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Note
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It closely resembles B. rotundifolia (Michx.) Wettst. which has slightly larger flowers, pedicels, and capsules, and sepals shaped slightly differently. Bacopa rotundifolia is a species of the southeastern United States.
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Specimen
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COCLk: Between Las Margaritas and El Valle, Woodson et al. 1754 (MO). DAME'N: El Real, Rio Tuira, Stern et al. 451 (MO, US). Edge of road on Othon's farm, El Real, Stern et al. 810 (MO, US). PANAMA: 5-6 mi E of Chepo on Panamerican Highway, Duke 4019 (MO). Las Sabanas in swamp, Heriberto 148 (US).
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