MANUAL OF THE GRASSES OF THE UNITED STATES 



645 



forming bushy tufts. % — Low sandy soil, Coastal Plain, south- 

 eastern Virginia to Florida and Louisiana; Cuba; Guatemala (fig. 

 1403). 



75. Panicum trifolium Nash. (Fig. 1404.) Vernal phase similar 

 to that of P. albomarginatum, the culms more slender, 20 to 50 cm 

 tall, the blades less crowded at the base, the upper blade not reduced. 

 Autumnal culms erect or leaning, sparingly branching from the middle 

 and upper nodes. % — Low mostly moist sandy woods, New Jer- 

 sey to Florida and Louisiana (fig. 1405). 



76. Panicum flavovirens Nash. (Fig. 1406.) Vernal phase bright 

 glossy green; culms very slender, ascending or spreading, 15 to 30 cm 



Figure 1403.— Distribution of 

 Panicum albomarginatum. 



Figure 1404.— Panicum trifo- 

 liu m. Two views of spikelet, 

 and floret, X 10. (Type.) 



Figure 1405.— Distribution of 

 Panicum trifolium. 



tall; blades 2 to 5 cm long, 3 to 4 mm wide, thin; panicle few- 

 flowered; spikelets 1.3 to 1.4 mm long, pubescent. Autumnal culms 

 spreading, decumbent or prostrate, branching from the lower and 

 middle nodes. % — Moist shady or mucky soil, North Carolina 

 to Florida and Mississippi (fig. 1407). Panicum albomarginatum, 

 P. trifolium, and P. flavovirens form a series of closely allied species. 

 77. Panicum concinnius Hitchc. and Chase. (Fig. 1408.) Vernal 

 phase bright green; culms very slender, 12 to 50 cm tall; blades 5 

 to 7 cm long, 5 to 6 mm wide; panicle 3 to 6 cm long; spikelets 1.1 

 mm long, pubescent. Autumnal culms radiate-spreading, late in 



Figure 1406.— Panicum flavo- 

 virens. Two views of spike- 

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



Figure 1407.— Distribution of 

 Panicum flavovirens. 



Figure 1408.— Pan i- 

 cum concinnius. 

 Two views of spike- 

 let, and floret, X 10. 

 (Type.) 



the season bearing a few branches, with somewhat reduced blades. 

 % — Moist sandy ground, northern Georgia, Florida, and northern 

 Alabama, rare. 



78. Panicum ensifolium Baldw. (Fig. 1409.) Vernal culms 20 to 

 40 cm tall, erect or reclining; blades distant, often reflexed, 1 to 3 cm 

 long, 1.5 to 3 cm wide, puberulent beneath, at least toward the tip; 

 panicle 1.5 to 4 cm long; spikelets 1.3 to 1.5 mm long, glabrous or 

 puberulent. Autumnal culms spreading or reclining, sparingly 

 branching from the middle nodes, the branches mostly simple. % — 

 Wet places, mostly sphagnum bogs or swamps, Coastal Plain, New 

 Jersey to Florida and Louisiana (fig. 1410). 



79. Panicum vernale Hitchc. and Chase. (Fig. 1411.) Vernal 

 phase light green, soft in texture; culms 15 to 30 cm tall, very slender, 



