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(Last Modified On 10/18/2012)
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(Last Modified On 10/18/2012)
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Species
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ICHNANTHUS TENUIS
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PlaceOfPublication
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Contr. U. S. Nat. Herb. 18:3 34. 1917.
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Synonym
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Oplismenus tenuis Presl, Rel. Haenk. 1:319. 1830. Panicum exile Steud. Nom. Bot. ed. 2. 2:256. 1841. Panicum alsinoides Griseb. Fl. Brit. W. Ind. 550. 1864. Ichnanthus alsinoides Munro ex Hemsl. Biol. Centr.-Amer. Bot. 3:500 1885.
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Description
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Annual; culms forming large loose mats, very slender, elongate, decumbent or creeping, rooting at the nodes, freely branching, the erect or ascending branches 10-40 cm. long, pubescent or pilose, rarely nearly glabrous; sheaths usually much shorter than the internodes, pilose or papillose-pilose with spreading hairs; blades ovate to ovate-lanceolate or lanceolate, 1-5 cm. long, 4-10 mm. wide, thin, gla- brous to pubescent and sparsely pilose; inflorescences terminal and axillary, long- exserted on slender peduncles, composed of 2 to several slender to spreading racemes, pubescent or pilose in the axils, the lower ones 1-3 cm. long; spikelets 3-4 mm. long, appressed, sparsely pilose, especially on the margins of the glumes and sterile lemma; first glume acuminate or attenuate, almost aristate, two-thirds to nearly as long as the spikelet; second glume and sterile lemma acuminate, equal or the glume a little longer, extending beyond the fruit; fruit 2-2.5 mm. long, oblong- elliptic, the wings reduced to inconspicuous scars.
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Note
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The spikelets are frequently proliferous and sterile, composed of few to several herbaceous lemmas.
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Distribution
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Moist forests, thickets, and shady places, British Honduras and Trinidad to Colombia and Brazil.
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Specimen
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BOCAS DEL TORO: Laguna de Chiriqui, von Wedel II22; Water Valley, von Wedel i78i, I857. CHIRIQUI: El Boquete, Hitchcock 8274; Cerro Vaca, Pittier 5366, 5370. CANAL ZONE: France Field, Maxon d Valentine 7077; Chagres, Fendler 373; Gatu'n, Hitchcock 9I86; between Bohio and Frijoles, Hitchcock 8394; Barro Colorado Island, Kenoyer I07; Obispo, Standley 3I77I; Culebra, Hitchcock 9I66, 9I67; Pittier 2II9; Sum- mit, D. H. Popenoe 2; Ancon Hill, Killip 4029, 42o8; Standley 26383; Las Cruces Trail, Cornman 2609; Balboa, Hitchcock 8ooo; Standley 25608. PANAMA: Chivi Chivi Trail, Cornman 4314; Rio Indio, Dodge d Allen I7296; Rio Tecu'men, Standley 2944I. With- out locality, Haenlze (TYPE).
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