654 



MISC. PUBLICATION 200, U. 



DEPT. OF AGRICULTURE 



15. Scoparia. — Species of various habit, vernal culms tall; ligules 



1 mm long or less; blades elongate, spikelets abruptly pointed, 



7- to 9-nerved; autumnal culms branching from the middle or 



upper nodes. 



99. Panicum scoparium Lam. (Fig. 1445.) 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 genic- 

 ulate 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 blotch- 

 es; spikelets 2.4 to 2.6 mm 

 long, obovate, turgid, papil- 

 lose-pubescent. Autumnal 

 phase leaning or spreading, 

 freely branching from the 

 middle nodes, forming fla- 

 bellate fascicles. % — 



Wet or damp soil, Massachusetts to Florida, west through Kentucky 



to Missouri, Oklahoma, and Texas; Cuba (fig. 1446). 



Figure 1444. — Panicum nodatum. 

 and floret, X 10. 



of spikelet, 



Figure 1445. — Panicum scoparium. Plant, X 1; two views of spikelet, and floret, X 10. (McGregor, 



212, S.C.) 



100. Panicum aculeatum Hitchc. and Chase. (Fig. 1447.) 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 



