(Last Modified On 10/22/2012)
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(Last Modified On 10/22/2012)
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Genus
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CENCHRUS L.
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PlaceOfPublication
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Sp. P1. 1049. 1753.
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Synonym
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Rarum Adans. Fam. P1. 2:35, 597. 1763. Cenchropsis Nash in Small, Fl. Southeast. U. S. 109. 1903.
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Description
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Spikelets sessile, enclosed in spiny burs composed of united sterile branches, the burs falling entire, the body of the bur irregularly lobed, the lobes rigid, the spines barbed; spikelets 1 to several in each bur, usually glabrous; first glume narrow, 1-nerved, much shorter than the spikelet, sometimes wanting; second glume and sterile lemma nearly equal, 3- to 5-nerved, the lemma enclosing a palea and usually a staminate flower; fruit indurate, the lemma acuminate, the margins thin, flat.
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Note
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Annuals or perennials with terminal racemes of burs.
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Key
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a. Burs subtended by a ring of slender bristles; spikelets 3 or 4 in each bur. b. Burs not more than 4 mm. wide, densely crowded in a long spike, the lobes interlocking; first glume obsolete - -- 1. C. BROWNII bb. Burs 5-7 mm. wide, not crowded, the lobes usually erect; first glume present --- ----2. C. ECHINATUS aa. Burs not subtended by a ring of slender bristles; spikelets usually 2 in each bur ------- - --- ------------ 3. C. PAUCIFLORUS
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