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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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LEERSIA HEXANDRA
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PlaceOfPublication
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Prodr. Veg. Ind. Occ. 21. 1788.
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Synonym
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Asprella hexandra Beauv. Ess. Agrost. 2, 153. 1812. Leersia mexicana H.B.K. Nov. Gen. & Sp. 1:195. 1816. Asprella mexicana Roem. & Schult. Syst. Veg. 2:267. 1817. Leersia contracta Nees, Agrost. Bras. 516. 1829. Oryza hexandra Doell in Mart. Fl. Bras. 22:10. 1871. Oryza mexicana Doell in Mart. Fl. Bras. 22:10. 1871. Leersia gouinii Fourn. Mex. P1. 2:2. 1886. Homalocenchrus gouinii Kuntze, Rev. Gen. P1. 2:777. 1891. Homalocenchrus hexandrus Kuntze, Rev. Gen. P1. 2:777. 1891. Leersia dubia Areschoug, Svensk Freg. Eugenies Resa, 115. 1910; Repert. Sp. Nov. (Fedde) 10:299. 1912.
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Description
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Aquatic perennial; culms slender, erect from a decumbent or creeping base, rooting at the lower nodes, 0.5 to more than 1 m. long, the nodes retrorsely hirsute; sheaths shorter than the internodes, keeled, glabrous, auriculate, the auricles acuminate; ligule 1-3 mm. long, truncate, fused with the auricles; blades 4-20 cm. long, 4-12 mm. wide, scabrous; panicles 4-15 cm. long, narrow, the short branches 1-4 cm. long, narrowly ascending, floriferous nearly to base; spikelets 3 mm. long, hispid, strongly hispid-ciliate on the keels of the lemma and palea; stamens 2.
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Distribution
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Swamps, wet ditches, and margins of rivers and lakes, southern United States, and the West Indies to Argentina.
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Specimen
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COCLE: Aguadulce, Pittier 4909. CANAL ZONE: Rio Chagres, Fairchild 2049; Gatusn, Hitchcock 7967; Barro Colorado Island, Kenoyer I27; Balboa, Hitchcock 8007. PANAMA: Matias Hernandez, Standley 28985; Panam'a, Piper 5247; Chepo, Pittier 4552.
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