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(Last Modified On 11/1/2012)
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(Last Modified On 11/1/2012)
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Genus
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PONTEDERIA ROTUNDIFOLIA L. f.
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PlaceOfPublication
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Suppi. 192. 1781.
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Synonym
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Pontederia cordifolia Mar.; R. & S. Syst. Veg. 7:1142. 1830. Unisema orbiculata Raf. Med. Fl. 2:108. 1830. Pontederia eriantha Miq. Linnaea 17:60. 1843.
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Description
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Plants rooting or creeping in the mud, with stems prostrate-ascending or floating. Leaves (or lower spathe valve) with ovate, sagittate, or reniform-cordate blade, up to 12 cm. long and 18 cm. broad; stipulate petiole up to 25 cm. long, slightly dilated for its lower half. Spathe sub-ensheathing the shortly spicate inflorescence; rachis pilose. Flowers condensed on rachis, 1.7-2.2 cm. long, more or less pilose and light-translucent except for few to many red-brown resin streaks prominent on the expanded perianth segments; tube about 1 cm. long, glandular- pubescent with rod-shaped glands, 2-3 mm. long; upper corolla lobe expanded and with twin yellow blotches, one on each side of mid-vein (often inconspicuous in fresh flowers), fused toward the base to the adjacent calyx lobes; calyx lobes slightly narrower than the corolla lobes, about 7 mm. long; filaments adnate to the tube at different levels, glandular-pubescent, up to 9 mm. long; anthers narrowly ovate, narrowed toward the apex, 1-1.5 mm. long; fully developed style 1.5 cm. long, with a subcapitate 6-lobed stigma. Fruit ovoid, spiny, about 6-7 mm. long.
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Distribution
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Mexico to Uruguay.
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Specimen
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CANAL ZONE: Rio Chagres near Gamboa, Allen 1963; Madden Lake, Woodson Schery 949; Miraflores Lake, Hunter & Allen 776.
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