118 



GRAMIXEAE (gHASS FAMILY) 



drooping ; spikelets long-ainnrd. the axon sometimes as much as 5 cm. long. — 

 (Panicum Tarsh ; 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. col5na (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-C cm. long) rather distant and racemose along the axis ; spike- 

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

 hut not awned. (Panicuni L.) — Ditches and low ground, Va. and Kan.,southw. 

 (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 .... . • . 

 No rootstocks. 



Bristles 5 or more 



Bristles 1-3. 

 Downwardly barbed . . . • . . , 



Upwardly barbed. 

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



spikelets 2 mm. long 



Spikelets 3 nun. long 



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



. 1. S. irtiberhis. 



, 2. S. glauca. 



. 3. S. vei'ticillata. 



4. S. riridis. 

 ■). S. itiilicit. 

 6. S. magna. 



1. S. imberbis 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 |-| as 

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

 elliptical-ovate acute striate transversely rugose /fertile lemma. 



— Moist soil, Ct. to Kan., and southw. (Trop. Am.) 

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



slender, wiry, 0-12 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 

 ascending, 3-12 dm. high ; leaves flat, linear-lanceolate, glau- 

 cous ; panicle 2-10 cm. long, about 1 cm. thick ; J/ristles^S mm. 

 long, upicardly scabrous; spikelets 3 mm. long ; first glume ^, 

 second | as long as the striate undulate-rugose fertile lemma. 



— Cultivated ground and waste places, common throughout. 

 (Nat. from Eu.) Fig. 00. 



3. S. verticill\ta (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, doivmoardly barbed, 3-0 mm. long ; spikelets 2-2.5 mm. long ; 

 first glume \ 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 Ku.) Fig. 70. 



4. S. vfRiDis (L.) Beauv. (Green F., Bottle Grass.) 

 Annual, tufted ; culms 2-0 cm. high ; leaves 0.5-2.5 dm. long, 

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



69. S. glauca. 

 Spikelet with sub- 

 tending bristles. 

 Same open, show- 

 ing fertile and 

 neutral flower X 3. 



70. S. verticil 

 lata. Spike 

 let X 4. 



