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Project Name Data (Last Modified On 10/22/2012)
 

Flora Data (Last Modified On 10/22/2012)
Genus SETARIA Beauv.
PlaceOfPublication Ess. Agrost. 51. P1. 13. f. 3. 1812.
Description Spikelets subtended by one or more bristles, the spikelets deciduous, the bristles persistent; first glume broad, less than half as long as the spikelet, 3- to 5-nerved; second glume and sterile lemma nearly equal, slightly longer than the fruit, or the glume sometimes shorter; fruit indurate, smooth or rugose. Annuals or perennials with flat, sometimes plaited blades, and spike-like, bristly panicles, or the panicles open with the spikelets rather crowded along the branches, some of the branches or branchlets reduced to sterile bristles around the spikelets.
Key a. Blades plaited, narrowly elliptic; bristles usually below only some of the spikelets. b. Plants annual; panicles 7-20 cm. long, narrow, the branches short, appressed, floriferous to the base; bristles 5-10 mm. long; spikelets 2.5 mm. long - -----1. S. BARBATA bb. Plants perennial; panicles 40-70 cm. long, the lower branches dis- tant, compound, ascending to spreading, as much as 25 cm. long-. 2. S. PANICULIFERA aa. Blades not plaited; bristles below all the spikelets. b. Bristles more or less retrorsely scabrous. c. Plants perennial; culms erect, densely tufted; spikelets subspheri- cal, appearing inflated - ------- --3. S. TENAX cc. Plants annual; culms decumbent-spreading or low-clambering. d. Panicles 3-8 cm. long, about 5 mm. thick, dense; bristles com- monly about 3 mm. long, retrorsely scabrous only at the tip, not implicate -----4. S. SCANDENS dd. Panicles as much as 15 cm. long, about 1 cm. thick; bristles 5-10 mm. long, prominently retrorsely scabrous above, some- what flexuous, becoming implicate - -- 5. S. TENACISSIMA bb. Bristles antrorsely scabrous only. c. Panicles 2-10 cm. long, dense, spike-like, the axis pubescent and sparsely villous; bristles below each spikelet more than 5; culms slender, 20-100 cm. long -6. S. GENICULATA cc. Panicles 15-30 cm. long, as much as 6 cm. wide, rather loose, the axis densely villous; bristles below each spikelet 1 or 2, 1-2 cm. long; culms coarse, as much as 2 m. long -7. S. VULPISETA
 
 
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