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(Last Modified On 10/22/2012)
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(Last Modified On 10/22/2012)
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Species
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OPLISMENUS BURMANNI (Retz.) Beauv.
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PlaceOfPublication
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Ess. Agrost. 54. 1812.
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Synonym
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Panicum burmanni Retz. Obs. Bot. 3:10. 1783. Orthopogon burmanni Trin. Fund. Agrost. 181. 1820. Oplismenus affinis Schult. Mant. 2:273. 1824. Oplismenus affinis Presl, Rel. Haenk. 1:323. 1830. Oplismenus cristatus Presl, Rel. Haenk. 1:323. 1830. Oplismenus preslii Kunth, Rev. Gram. 1: Suppl. X. 1830. Panicum scbultesii Steud. Nom. Bot. ed. 2. 2:263. 1841. Oplismenus bumboldtianus var. muticus Fourn. Mex. P1. 2:37. 1886. Oplismenus bumboldtianus var. nudicaulis Vasey, Contr. U. S. Nat. Herb. 1:363. 1893.
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Description
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Low creeping annual; culms slender, 15-50 cm. long, nearly simple to freely branching, with short internodes, decumbent or prostrate-spreading with ascend- ing branches; sheaths usually much shorter than the internodes, sparsely to densely papillose-hispid, the margins densely ciliate; blades broadly lanceolate-elliptic, often asymmetrical, acuminate, 1.5-5 cm. long, 5-15 mm. wide, glabrous to pubescent or hirsute, the margins scabrous; inflorescence 1-6 cm. long, frequently long- exserted, of 3-6, rarely 10, short approximate racemes, the axis densely villous, flexuous; racemes 0.5-2 cm. long, ascending, the rachis densely villous; spikelets 3 mm. long, usually densely villous; glumes minutely lobed, about 2 mm. long, the second a little longer than the first; awns antrorsely scabrous, that of the first glume 10-14 mm. long, of the second 3-8 mm. long; sterile lemma minutely lobed, awnless, or with an awn 1-3 mm. long; fruit 2 mm. long, narrowly elliptic, acute.
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Common
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Pajita de raton
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Distribution
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Moist forests, thickets, and savannas; a common weed in fields and waste places, Mexico and the West Indies to Brazil; Tropics of both hemispheres.
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Specimen
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BOCAS DEL TORO: Bocas del Toro, Carleton i8; Laguna de Chiriqui, Hart 74; Water Valley, von Wedel I494; Quebrada Nigua, von Wedel 2739; Changuinola Valley, Stark 52; Almirante, Cooper 98. CHIRIQUI: El Boquete, Hitchcock 8304; San Felix, Pittier 5205. CANAL ZONE: Chagres, Fendler 363; Gamboa, Standley 285I2; Valley of Masambi, Maxon 4688; Empire, Hitcbcock 795I; Culebra, Hitchcock 9I65; Pittier 2086; Ancon Hill, Killip 4244; Sosa Hill, Standley 25248; Balboa, Standley 2545I; Balboa Heights, Killip 4I80. PANAMA: Matias Hern'andez, Pittier 6822; Panam'a, Killip 4I9I; Rio Tapia, Standley 28050; Rio Tecumen, Standley 26538; Chepo, Hunter d Allen I3; Taboga Island, Standley 27080; McBride 2806; Allen I30I. WITHOUT LOCALITY: Haenke (TYPE).
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