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(Last Modified On 10/16/2012)
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(Last Modified On 10/16/2012)
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Species
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LUZIOLA subintegra
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Description
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Aquatic perennial; culms rather thick, succulent, rooting at the nodes, fre- quently floating, glabrous; sheaths loose, inflated, transversely veined, usually longer than the internodes, glabrous, auriculate, the auricles 1-8 cm. long, fused with the ligule, attenuate to a fine point; blades elongate, acuminate, 1-2.5 cm. wide, gradually narrowed to the thickened base, scabrous and sparsely pilose on both surfaces, the margins hispid-scabrous, almost serrate; staminate panicles 12- 15 cm. long, the slender branches ascending to spreading, sparsely pilose, rather densely villous in the axils, the lowest ones subverticillate; spikelets 6 mm. long, the lemma and palea thin, glabrous; pistillate inflorescences partly enclosed, pro- truding sidewise from the inflated sheaths, 5-6 cm. long, about as broad; branches numerous, at first stiffly ascending, finally spreading or reflexed, implicate, glabrous, terminating in a spikelet, the peduncle flat, weak, easily drooping, the panicle turned downward in the water; spikelets at time of flowering 4-5 mm. long, nar- row, acuminate, pale, the lemma and palea thin, but not readily disintegrating, prominently nerved, bulged out at maturity exposing the fruit; caryopsis 2 mm. long, subspherical, minutely striate.
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Specimen
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CANAL ZONE: floating in Chagres River at Juan Mina, June 25-Aug. 29, 1940, Bart- lett & Lasser 16816 (TYPE).
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Note
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Similar in habit to L. spruceana Benth. but differing in the characters of the pistillate inflorescences. In L. spruceana the branches of the pistillate panicles are very scabrous, not terminating in a spikelet, and the lemma and palea are fragile, readily disintegrating between the nerves leaving the caryopsis subtended by bristles. The nerves of the lemma and palea are also more scabrous than in L. subintegra.
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