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



34. Panicum roanokense Ashe. (Fig. 1328.) Vernal phase some- 

 what glaucous olive green; culms erect or ascending, 50 to 100 cm. 

 tall; blades at first stiffly erect, later somewhat spreading, 3 to 8 mm 

 wide, glabrous; panicle 4 to 8 cm long; spikelets 2 mm long, turgid, 

 elliptic, glabrous, the second glume often purple at base. Autumnal 

 phase erect or decumbent, branching at the middle and upper nodes, 

 the branches numerous but not in tufts, the reduced blades subinvo- 

 lute. Ql — Open swampy woods or wet peaty meadows, Coastal 

 Plain, southeastern Delaware to Florida and Texas; Jamaica (fig. 1329). 



35. Panicum caerulescens Hack. (Fig. 1330.) Vernal phase 

 similar to that of P. roanokense; culms more slender; blades ascending 



Figure 1328. — Panicum roanokense. 

 Two views of spikelet, and floret, 

 X 10. (Ashe, N.C.) 



Figure 1329.— Distribution of 

 Panicum roanokense. 



Figure 1330. — Panicum caeru- 

 lescens. Two views of spikelet, 

 and floret, X 10. (Type.) 



or spreading, commonly purplish beneath; panicle 3 to 7 cm long; 

 spikelets 1.5 to 1.6 mm long, obo void, turgid, glabrous. Autumnal 

 phase erect or leaning, producing short densely fascicled branches at 

 the middle and upper nodes, these tufts scarcely as long as the primary 

 internodes. Qi — Marshes and swampy woods, Coastal Plain, south- 

 ern New Jersey to Florida and Mississippi; Cuba (fig. 1331). 



36. Panicum lucidum Ashe. (Fig. 1332.) Vernal phase at first 

 erect and resembling that of P. dichotomum, but the weak culms soon 

 decumbent; blades thin, shining, bright green, glabrous, at first erect 

 but soon widely spreading, 4 to 6 mm wide ; panicle resembling tha, 

 of P. dichotomum but fewer-flowered; spikelets 2 to 2.1 mm longt 



Figure 1331.— Distribution of 

 Panicum caerulescens. 



Figure 1332. — Panicum 



lucidum. Two views of 



spikelet, and floret, X 10. 

 (Type.) 



Figure 1333.— Distribution of 

 Panicum lucidum. 



elliptic, glabrous (rarely pubescent), the tip of the fruit exposed at 

 maturity. Autumnal phase repeatedly branching, forming large 

 clumps or mats of slender weak vinelike culms, the branches elongate 

 and diverging at a wide angle, not fascicled, the blades waxy, flat, 

 spreading. Ql — Wet woods and sphagnum swamps, Coastal Plain, 

 Massachusetts to Florida, Arkansas, and Texas; Indiana (near Lake 

 Michigan), Michigan (Port Huron) (fig. 1333). 



37. Panicum sphagni cola Nash. (Fig. 1334.) Vernal phase grayish 

 olive green; culms strongly flattened, erect or reclining, 50 to 100 cm 

 tall; sheaths soon divaricate; blades glabrous, 3 to 7 mm wide; panicle 

 narrow, 5 to 6 cm long; spikelets 2.5 mm long, elliptic, glabrous or 



