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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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ISCHAEMUM RUGOSUM Salisb.
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PlaceOfPublication
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Icon. Stirp. Rar. 1. pl. i. 1791.
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Description
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Annual; culms erect or decumbent at the base, rather freely branching from nearly all the nodes, the nodes bearded; sheaths rather loose, keeled toward the summit, glabrous or sparsely papillose-pilose near the summit; ligule 2-3 mm. long; blades mostly 10-15 cm. long, 6-12 mm. wide, acuminate, narrowed toward the base, sometimes petiole-like, the margins very scabrous; racemes in pairs, ap- pressed together and appearing as if one when young, 3-10 cm. long, terminal on the main culm and branches, long-exserted from the upper bladeless sheath, the rachis thick, readily disarticulating, ciliate on the outer edges; spikelets 3-4 mm. long, obtuse, the summit membranaceous, otherwise indurate with 3-5 strong transverse ridges; awns 1.5 cm. long, tightly twisted below, loosely twisted above the bend.
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Distribution
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A common weed in fields, clearings, brushy slopes, and waste ground. Intro- duced in Panama, Cuba, and Jamaica; a native of the Old World.
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Specimen
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CANAL ZONE: France Field, Standley 28587; Gatuin, Hitchcock 9I83; New Frijoles, Pittier 683I; Barro Colorado Island, Standley 4095I; Darien Station, Standley 3I509; Tabernilla, Hitchcock 838I; Culebra, Standley 26029; Summit, Standley 269I4, 27329; D. H. Popenoe I9; between Miraflores and Pedro Miguel, Pittier 2506; between Fort Clay- ton and Corozal, Standley 29097; Balboa Heights, Killip 4184. PANAMA: Abalaba, Killip 4268.
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