624 MISC. PUBLICATION 200, U. S. DEPT. OP AGRICULTURE 



4. Bicknelliana. — In small tufts, erect or ascending; sheaths gla- 

 brous; ligules nearly obsolete; panicles few-flowered; spikelets 

 long-pediceled, 7-nerved. Autumnal culms sparingly branch- 

 ing from upper or middle nodes, the blades not much reduced. 

 Intermediate in habit between Depauperata and Dichotoma. 

 22. Panlcum bicknellii Nash. (Fig. 1306.) Vernal phase bluish 



green; culms 30 to 50 cm tall; nodes sparsely bearded or glabrous; 



Figure 1301. Panicum arenicoloides. 

 Two views of spikelet, and floret, X 

 10. (Type.) 



Figure 1302.— Distribution of 

 Panicum arenicoloides. 



blades stiffly ascending, 8 to 15 cm long, 3 to 8 mm wide, the upper- 

 most usually the longest, narrowed toward the usually ciliate base; 

 panicle 5 to 8 cm long, the branches ascending; spikelets 2.3 to 2.8 

 mm long, sparsely pubescent or rarely glabrous. Autumnal culms 

 erect, forming a loose bushy tuft, the stiffly ascending blades not much 

 reduced, overtopping the narrow few-flowered panicles. 91 — Dry 



Figure 1304.— Distribution of 

 Panicum ovinum. 



Figure 1303.— Panicum ovinum. Two 

 views of spikelet, and floret, X 10. 

 (Type.) 



sterile or rocky woods, Connecticut and Michigan to Georgia and 

 Missouri (fig. 1307). 



23. Panicum calliphy Hum Ashe. (Fig. 1308.) Vernal phase yellow- 

 ish green; culms 35 to 50 cm tall; nodes sparsely villous; blades 

 ascending, 8 to 12 cm long, 9 to 12 mm wide, ciliate at the rounded 

 base; panicle 7 to 9 cm long, with a few ascending branches; spikelets 

 mostly 3 mm long, elliptic, sparsely pubescent. Autumnal culms 



sparingly branching from the middle nodes, 

 the branches about as long as the inter- 

 nodes, erect. % — Woods, rare and local, 

 Ontario, Massachusetts, New York, Ohio. 

 5. Nudicaulia. — A single rare and local 

 species. 

 24. Panicum nudicaule Vasey. (Fig. 

 1309.) Vernal culms erect from a some- 

 what 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 re- 

 duced, giving the culm a naked appearance; panicle long-exserted, 4 

 to 7 cm long, few-flowered, the branches ascending; spikelets 2.7 to 

 2.9 mm long, narrowly ovate, acuminate, glabrous. Autumnal phase 



Figure 1305.— Panicum neuranthum. 

 Two views of spikelet, and floret, 

 X10. (Type.) 



