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(Last Modified On 5/9/2013)
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(Last Modified On 5/9/2013)
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Species
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Hydrilla verticillata (L. f.) Royle
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PlaceOfPublication
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Ill. Bot. Himal. Pl. 376. 1839.3-FIG. 1.
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Synonym
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Serpicula verticillata L. f., Suppl. 416. 1781. Udora verticillata (L. f.) Spreng., Syst. 1: 170. 1825. Vallisneria verticillata (L. f.) Roxb., Fl. Ind., ed. Carey. 3: 751. 1832. Elodea verticillata (L. f.) F. Muell., Key Syst. Vict. P1. 1: 423. 1888.
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Description
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Stems branched. Leaves with the lower in whorls of 3, linear to linear-lanceo- late, sometimes obovate, the lowest sometimes alternate, 5-14 mm long and 1-1.5 mm wide, the middle and upper in whorls of 3-8, linear-lanceolate, acute, serrate, 10-25(-40) mm long and 1-2 mm wide; squamulae intravaginales 2, axillary, oblong, membranous, transparent, fringed, to 0.5 mm long. Staminate spathe solitary in the leaf-axil, 1.25-1.5 mm high, tearing open when the flower is released; pedicel 1-2 mm long; sepals white, often- tinged with red, 1.5-3 mm long and 1 mm wide; petals white, often tinged with red, 2-3 mm long and 0.5 mm wide, falling before the sepals; stamens with slender, short filaments and linear anthers. Carpellate spathe ca. 5 mm long; sepals white, sometimes with red dots, 1.5-3 mm long and 0.75 mm wide, petals white, 1.5-3 mm long and 0.3-0.5 mm long; hypanthium 1.5-10 cm long; ovary 3-4 mm long, the styles 0.8-1 mm long. Fruits elongate, with a constriction between each pair of seeds, 4-7 mm long, surrounded basally by the remnants of the spathal bracts and bearing the remnant of the hypanthium (1.5-3 cm long) apically; seeds 2-6, in a row, cylindrical, oblong, apiculate at one side, 2-3 mm long, the testa smooth, dark brown.
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Distribution
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Widely distributed in the Old World, from southern and eastern Europe, Africa, southern and eastern Asia, to Australia. The records from Panama are the first from the Americas.
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Specimen
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CANAL ZONE: Barro Colorado Island, extremely abundant around edges of Gatun Lake, Croat 7946 (MO). Chagres River, Dwyer & Robyns 75 (MO). Chagres River at Colon High- way bridge, Lazor & Tyson 3046 (MO). Gamboa, Panama Canal Company Dept. of Sanitation Boat Dock, Lazor 3493, 3494 (both MO).
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