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



surface, velvety-puberulent beneath; panicle 3 to 8 cm long, rather 

 densely flowered; spikelets 1.2 to 1.3 mm long, densely papillose- 

 pubescent. Autumnal culms at first sending out from lower and mid- 

 dle nodes long branches similar to primary culms, later producing more 

 or less fascicled branches. % — Low pinelands, Coastal Plain, 

 New Jersey to Florida and Louisiana; West Indies (fig. 1340). 



41. Panicum longiligulatum Nash. (Fig. 1341.) Vernal culms 30 

 to 70 cm tall; sheaths glabrous; ligule 2 to 3 mm long; blades 4 to 8 

 mm wide, glabrous on the upper surface, puberulent beneath; panicle 

 3 to 8 cm long, the slender branches stiffly ascending; spikelets 1.1 to 

 1.2 mm long. Autumnal culms reclining, the branches spreading, 



Figure 1338.— Distribution of 

 Panicum lindheimen. 



Figure 1339. — Panicum 

 leucothrii. Two views 

 of spikelet, and floret, 

 X 10. (Type.) 



Figure 1340.— Distribution of 

 Panicum leucothrix. 



the branchlets crowded, the blades subin volute. % — Low 

 pine barrens and swamps, Coastal Plain, Pennsylvania (Bucks County), 

 southeastern Virginia to Florida and Texas; Tennessee; Central 

 America (fig. 1342). 



42. Panicum wrightianum Scribn. (Fig. 1343.) Vernal culms 

 weak, slender, ascending from a decumbent base, 15 to 40 cm tall, 

 minutely puberulent; sheaths glabrous or puberulent; ligule 2 to 3 mm 

 long; blades 2 to 4 cm long, 3 to 5 mm wide, glabrous or puberulent 

 beneath and minutely pilose above; panicle 3 to 6 cm long; spikelets 

 1 mm long. Autumnal cidms decumbent-spreading, sending out from 

 lower and middle nodes numerous ascending branches, becoming 





Figure 1341.— Panicum 

 longiligulatum. Two 

 views of spikelet, and 

 floret, X 10. (Type.) 



Figure 1342.— Distribution of 

 Panicum longiligulatum. 



Figure 1343.— Pani- 

 cum wrightianum. 

 Two views of 

 spikelet, and flo- 

 ret, X 10. (Type.) 



bushy-branched, the flat or subinvolute blades and secondary pani- 

 cles not greatly reduced. % — Margins of streams and ponds in 

 sandy or mucky soil, Coastal Plain^ Massachusetts to Florida and 

 Mississippi; Cuba and Central America (fig. 1344). 

 8. Lanuginosa.— Mostly pubescent throughout; ligules densely hairy, 

 2 to 5 mm long; spikelets 5- to 9-nerved, pubescent Autumnal 

 culms usually freely branching, the leaves and panicles mostly 

 greatly reduced. 

 43. Panicum meridionale Ashe. (Fig. 1345.) Vernal culms 15 

 to 40 cm tall, the lower internodes and sheaths pilose, the upper 

 minutely appressed-pubescent; ligule 3 to 4 mm long; blades 1.5 to 

 4 cm long, 2 to 4 mm wide, long-pilose on the upper surface, the hairs 

 erect; panicle 1.5 to 4 cm long, the axis appressed-pubescent to 



