118 GBAMINEAE (GRASS FAMILY) 



drooping ; spikelets long-awned, the awn sometimes as much as 5 cm. long. 

 (Panicum Pursh ; P. hispidum Muhl.) Marshes and ditches chiefly near the 

 coast, N. H. to Fla. ; and in w. Ont. and n. 111. Aug. -Oct. 



3. E. colbna (L.) Link. (JUNGLE RICE.) Tufted, erect or ascending, spar- 

 ingly branched, 3-6 dm. high ; sheaths and blades smooth ; panicle of 5-10 

 dense racemes (1-6 cm. long) rather distant and racemose along the axis spike- 

 lets about 3 mm. long ; glumes and sterile lemma pubescent, mucronate-pointed 

 but not awned. (Panicum L.} Ditches and low ground, Va. and Kan., south w. 

 (Warm regions generally.) 



14. SETARIA Beauv. BRISTLY FOXTAIL GRASS 



Spikelets as in Panicum but surrounded by few or many persistent awn- 

 like branches which spring from the rhachis below the articulation of the 

 spikelets. Annual introduced weeds in cultivated or manured grounds, or 

 native perennials, with linear or lanceolate flat leaves and cylindrical spike- 

 like panicles. (Name from seta, a bristle.) CHAETOCHLOA Scribn. 



Perennial by creeping rootstocks 1. S. imberbis. 



No rootstocks. 



Bristles 5 or more 2. 8. glauca. 



Bristles 1-3. 



Downwardly barbed .... 3. S. verticillata. 



Upwardly barbed. 

 Lemmas rupose ; panicle not exceeding 1.5 dm. in length. 



Spikelets 2 mm. long 4. S. viridis. 



Spikelets 3 mm. long 5. S. italica. 



Lemmas smooth and shining ; panicle 2-6 dm. long 6. S. magnet. 



1. S. imbrbis R. & S. Culms more or less caespitose, 3-7 dm. high, slender, 

 compressed, erect or ascending, often geniculate at base ; sheaths overlapping, 

 compressed, glabrous ; blades 1-3 dm. long, 3-7 mm. wide, attenuate toward 

 the apex ; panicle 2-5 cm. long, nearly 1 cm. thick, exclusive of bristles ; bristles 

 8-12, 5-10 mm. long, pale yellowish, sometimes purplish, upwardly scabrous ; 

 spikelets 2 mm. long ; first glume about % as long as the spikelet, second J-| as 

 long, acute, 5-7-nerved, the midnerve excurrent ; sterile lemma equaling the 

 elliptical-ovate acute striate transversely rugose fertile lemma. 

 Moist soil, Ct. to Kan., and south w. (Trop. Am.) 



Var. perSnnis (Hall) Hitchc. Culms scarcely tufted, very 

 slender, wiry, 6-12 dm. high ; blades long and narrow ; pani- 

 cles 2-7 cm. long, more slender ; spikelets and bristles usually 

 purplish. (Chaetochloa versicolor Bicknell.) Brackish 

 marshes along the coast, Ct. to Fla. ; and in saline soil, Kan. 

 and I. T. June-Sept. Intergrades with the species. 



2. S. GLAUCA (L.) Beauv. (FOXTAIL, PIGEON GRASS.) 

 Annual ; culms branching at the base, compressed, erect or 

 Spike'let'with C sub- ascendin g 3 ~ 12 dm - hi g h 5 leaves flat, linear-lanceolate, glau- 

 tending bristles. cous > P anicle 2 ~1 cm. lon about 1 cm. thick ; bristles 3-8 mm. 

 Same open, show- l n gi upwardly scabrous ; spikelets 3 mm. long ; first glume |, 

 ing fertile and second f as long as the striate undulate-rugose fertile lemma. 

 neutral flower x 3. Cultivated ground and waste places, common throughout. 

 (Nat. from Eu.) FIG. 69. 



3. S. VERTICILLATA (L.) Beauv. Annual, tufted ; culms 3-6 dm. high ; 

 leaves linear-lanceolate, scabrous ; panicles green, 5-10 cm. long, 

 somewhat compound, interrupted at base, tapering above ; bristles 



stout, downwardly barbed, 3-6 mm. long; spikelets 2-2.5 mm. long ; 

 first glume 1 as long as the second which equals the sterile lemma 

 and slightly exceeds the abruptly apiculate obscurely transverse- 

 rugose fertile lemma. Near dwellings, widely distributed in 

 eastern U. S. (Nat. from Eu.) FIG. 70. 



4. S. VIRIBIS (L.) Beauv. (GREEN F., BOTTLE GRASS.) 70. S verticil 

 Annual, tufted; culms 2-9 cm. high; leaves 0.5-2.5 dm. long, iata'. Spike 

 4-10 mm. wide, scabrous on the margins ; panicles rather thick, let x 4. 



