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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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Najas guadalupensis (Spreng.) Magnus
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PlaceOfPublication
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Beitr. Gatt. Najas 8. 1870.
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Synonym
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Caulinia guadalupensis Spreng., Syst. 1: 20. 1825.
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Description
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Plants glabrous, monoecious (?). Stems 0.3-0.8 mm in diameter, profusely branched; lower internodes elongate (to 4 cm long), the upper internodes shortened (to 5 mm long or less). Leaves 1.2-2.8 cm long; laminas 1.2-1.8 mm wide, acute, mucronate, minutely serrulate with ca. 100 teeth per side, the mucro and 2 subterminal teeth larger than the lateral teeth, the teeth unicellular; auricles to 1.9 mm wide, barely wider than the laminas, only slightly flared below, with usually 7 teeth on the upper half of each side, none below, the teeth similar in structure to but larger than those of the laminas. Flowers solitary, the involucre light green with brown streaks; staminate flowers not seen; carpellate flowers to 1.5 mm long, the involucre above the ovary abruptly narrowed into a short beak, usually ending in 3 sharp-tipped lobes, the style ending in 2-3 stigmatic lQbes that extended above the involucral beak. Fruit 1.2-1.6 mm long and 0.4-0.6 mm wide, yellowish-white, fusiform, with a single basally flattened keel-like rib along which the involucre splits, the areolae inconspicuous, broader than long, to 0.2 mm long and 0.6 mm wide, (4-)6-angled, in ca. 20 longitudinal rows; seeds fusiform, greenish-white with 2 dark bands.
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Note
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Our examination of specimens from all parts of the Western Hemisphere indicates that Najas guadalupensis is a highly variable taxon. Further research may indicate that infraspecific taxa should be recognized or that this complex should be considered as several closely related species. Clausen (Rhodora 38: 333-345. 1936) and Ooststrom (Rec. Trav. Bot. Neerl. 36: 705. 1939) have reached similar conclusions. Several names have been proposed in apparent reference to this group, but at present, we have chosen the conservative approach in designating the Panamanian material as N. guadalupensis.
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Specimen
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BOCAS DEL TORO: United Fruit Company boat landing ca. 4 mi. E of Changuinola on the Changuinola River, Lazor, Tyson & Loftin 2690 (FSU).
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