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



27. Panicum microcarpon Muhl. ex 

 Ell. (Fig. 936.) Vernal culms tufted, 

 erect or sometimes geniculate at base, 

 60 to 100 cm. tall, the nodes densely 

 bearded with reflexed hairs; sheaths 

 often mottled with white spots be- 

 tween the nerves; blades spreading, 

 the upper often reflexed, 10 to 12 cm. 

 long, 8 to 15 mm. wide, glabrous, 

 sparsely papillose-ciliate at base; pan- 

 icle many-flowered, 8 to 12 cm. long; 

 spikelets 1.6 mm. long, elliptic, gla- 

 brous (rarely minutely pubescent). 

 Autumnal phase much branched from 

 all the nodes, reclining from the 

 weight of the dense mass of branches ; 

 blades flat, mostly 2 to 4 cm. long. 

 01 — Wet woods and swampy places, 

 Massachusetts to Illinois, south to 

 northern Florida and eastern Texas. 



28. Panicum nitidum Lam. (Fig. 

 937.) Vernal culms tufted, erect, 30 to 

 60 cm. tall, the nodes bearded with 

 reflexed hairs; upper sheaths often 

 glandular-mottled; blades glabrous, 5 

 to 10 mm. wide, the upper usually re- 

 flexed; panicle ovoid, 5 to 8 cm. long, 

 many-flowered; spikelets elliptic, 2 

 mm. long, pubescent. Autumnal 



Figure 935. — Panicum nudicaule. Two views of spike- 

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



26. Panicum nudicaule Vasey. 

 (Fig. 935.) Vernal culms erect from 

 a somewhat spreading base, 40 to 60 

 cm. tall, glabrous; sheaths glabrous; 

 blades erect, rather thick, 4 to 10 cm. 

 long, 5 to 8 mm. wide, the uppermost 

 reduced, giving the culm a naked ap- 

 pearance; panicle long-exserted, 4 to 

 7 cm. long, few-flowered, the branches 

 ascending; spikelets 2.7 to 2.9 mm. 

 long, narrowly ovate, acuminate, gla- 

 brous. Autumnal phase unknown. 

 % — Swamps, rare, western Florida, 

 southern Alabama, and Mississippi. 



6. Dichotoma. — Culms few to many 

 in a tuft, glabrous, or only the 

 nodes pubescent; sheaths mostly 

 glabrous or nearly so; ligules 

 minute; panicles open; spikelets 

 5- to 7-nerved. Autumnal culms 

 usually freely branching; leaves 

 and panicles usually much re- 

 duced. 



Figure 936. — Panicum microcarpon. Plant, X 1; two views of spikelet, and floret, X 10. (Maxon and Standley 



86, Md.) 



