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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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SORGHASTRUM INCOMPLETUM (Presl) Nash
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PlaceOfPublication
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N. Amer. Fl. 17:130. 1912.
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Synonym
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Andropogon incoinpletus Presl, Rel. Haenk. 1:342. 1830. Andropogon nutans var. incoinpletus Hack. in DC. Monogr. Phan. 6:531. 1889.
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Description
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Slender annual; culms erect or ascending from a somewhat decumbent base, sometimes rooting at the lower nodes, commonly 20-50 cm., but sometimes as much as 2 m. high, simple or branching from the base, glabrous, the nodes appressed-pubescent; sheaths rounded or keeled toward the summit, glabrous; ligule firm, 0.5-2 mm. long; blades commonly 6-15 cm. long, 2-4 mm. wide, but on larger plants as much as 25 cm. long and 8 mm. wide, pustulose or papillose- roughened, usually pilose on the upper surface, the margins scabrous; panicles 5-20 cm. long, the slender rather distant branches ascending, the secondary branches and peduncles of the short racemes very slender or filiform, flexuous or tortuous, the peduncles glabrous or sparsely covered with long hairs; spikelets 3.5-5 mm. long, the first glume usually truncate, the tip minutely hispidulous, hirsute on the back, sometimes only near the base; rachis joints and pedicels densely ciliate with white or yellowish hairs; awns 2-4.5 cm. long, twice-geniculate, the two lower segments tightly twisted, usually villous, dark brown.
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Distribution
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Savannas and grassy fields and hillsides, Mexico to Colombia; tropical Africa.
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Specimen
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CHIRIQUf: El Boquete, Hitchcock 8i84, 8244; Rlo Dupi, Pittier 5227; between Cerro Vaca and Hato del Loro, Pittier 5385. COCLE: Ola, Pittier 5037. CANAL ZONE: between Fort Clayton and Corozal, Standley 29036, 29072. PANAMA: between Las Sabanas and Matias Hernaindez, Standley 3I850; Juan Diaz, Killip 4224; Pacora River, Killip 42I3; Rio Tecumen, Standley 26605, 29394.
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