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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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ORTHOCLADA LAXA
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PlaceOfPublication
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Ess. Agrost. 70, 149, 168. 1812.
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Synonym
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Aira laxa L. Rich. Act. Soc. Hist. Nat. Paris 1:106. 1792. Panicum rariflorum Lam. Encycl. 4:746. 1798. Orthoclada rariflora Beauv. Ess. Agrost. 70. pl. I4. f. 9. 1812.
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Description
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Erect or decumbent-spreading, sparingly stoloniferous perennial; culms 60 cm. to more than 2 m. long, glabrous; sheaths rather densely pilose or sometimes nearly glabrous, usually shorter than the internodes; ligule a very short ciliate membrane; blades 5-17 cm. long, 1-3 cm. wide, acuminate, narrowed at the base to a petiole 2-3 cm. long, hispid on the upper surface, glabrous below with conspicuous cross- veins; panicle diffuse, 15-30 cm. long, about as wide, the branches rather readily disarticulating, stiffly spreading, spikelet bearing only at the ends; spikelets 6-7 mm. long; glumes subequal, acuminate, 3-4 mm. long, the first 3-nerved, the second 5-nerved, scabrous on the nerves; lemma about 6 mm. long, 5-nerved, sparsely scabrous. Moist woods, thickets, and stream banks, Mexico to Brazil and Peru
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Specimen
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BOCAS DEL TORO: Laguna de Chiriqui, Hart 7I; Old Bank Island, von VWedel 20I9, 2I67; Changuinola Valley, Dunlap i8iA, i86. CHIRIQUf: Rio Dupi, Pittier 5220. CANAL ZONE: Fort Sherman, Standley 3II08; Las Cruces, Pittier 2324, 26I5; Frijoles, Maxon 4700; Pittier 2682; Killip 4285; Barro Colorado Island, Bailey & Bailey 86; Standley 3I340; Darien, Standley 3I639; Obispo, Standley 3I730; Las Cascadas, Killip 4254; Maxon 4678; Culebra, Hitchcock 9209; East Paraiso, Standley 29923, 29974. PANAMA: Rio Chagres, Dodge & Allen I7353; Orange River, Cornman 607; Rio Tapia, Hitchcock 22949; Juan Diaz, Standley 30576; Rio Tecu'men, Hunter & Allen 2I7.
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