674 



MISC. PUBLICATION 200, U. S. DEPT. OF AGRICULTURE 



second shorter than the fruit. Au- 

 tumnal culms erect or leaning, branch- 

 ing from all but the uppermost nodes, 

 the branches spreading. % — Dry 

 woods and prairies, central and 

 southern Texas. 



Figure 

 views 



1009. — Panicum pedicellatum. Plant, X 1 ; two 

 of spikelet, and floret, X 10. (Heller, Tex.) 



Figure 1010. — Panicum nodatum. Two views of spike- 

 let, and floret, X 10. (Type.) 



101. Panicum nodatum Hitchc. and 

 Chase. (Fig. 1010.) Vernal culms 

 tufted, ascending or spreading, hard 

 and wiry, 25 to 35 cm. tall, finely 

 papillose, crisp-puberulent ; blades 

 firm, ascending, 3 to 5 cm. long, 3 

 to 6 mm. wide, puberulent on both 

 surfaces; panicle 4 to 5 cm. long, few- 

 flowered; spikelets 4 mm. long, pyri- 

 f orm. Autumnal culms widely genicu- 

 late-decumbent, branching from all 

 but the uppermost node, the branches 

 somewhat divaricate, the nodes of the 

 main culm swollen. % — Oak 

 woods in sand dunes, southern Texas 

 and northern Mexico. 



15. Scoparia. — Species of various 

 habit, vernal culms tall; ligules 

 1 mm. long or less; blades 

 elongate; spikelets abruptly 

 pointed, 7- to 9-nerved; autum- 

 nal culms branching from the 

 middle or upper nodes. 



102. Panicum scoparium Lam. (Fig. 

 1011.) Vernal phase grayish olive 

 green, velvety-pubescent throughout 

 except on a viscid ring below the 

 nodes and at the summit of the 

 sheath; culms 80 to 130 cm. tall, 

 stout, erect or ascending, usually 

 geniculate at base; blades rather 

 thick, 12 to 20 cm. long, 10 to 18 

 mm. wide; panicle 8 to 15 cm. long, 

 the axis and branches with viscid 

 blotches; spikelets 2.4 to 2.6 mm. 

 long, obovate, turgid, papillose-pubes- 

 cent. Autumnal phase leaning or 

 spreading, freely branching from the 

 middle nodes, forming flabellate fas- 

 cicles. % — Wet or damp soil, 

 Massachusetts to Florida, west 

 through Kentucky to Missouri, Okla- 

 homa, and Texas; Cuba. 



103. Panicum aculeatum Hitchc. 

 and Chase. (Fig. 1012.) Vernal culms 

 in large clumps, slender, 70 to 100 

 cm. tall, ascending, scabrous, harshly 

 pubescent below; sheaths papillose- 

 hispid with stiff sharp-pointed hairs, 

 a puberulent ring at the summit, the 

 uppermost usually glabrous; blades 

 firm, stiffly ascending or spreading, 

 12 to 20 cm. long, 9 to 13 mm. wide, 



