MANUAL OF THE GRASSES OF THE UNITED STATES 



679 



on the upper side at the folded base; panicles 10 to 25 cm long, rarely 

 more than 5 cm wide, the long branches erect, naked at base, with 

 appressed branchlets bearing crowded spikelets, the pedicels not 

 pilose; spikelets 2.2 to 2.5 mm long. % — Borders of streams and 

 ponds and in wet places, Coastal 

 Plain, Pennsylvania to Florida 

 and Texas; West Indies (fig. 

 1523). 



149. Panicum stipitatum Xash. 

 (Fig. 1524.) Resembling P. 

 agrostoides; often purple tinged 

 throughout, especially the pani- 

 cles; sheaths much overlapping, 

 the blades usually equaling or 

 exceeding the terminal panicle; 

 panicles usually several to a culm, 

 10 to 20 cm long, narrow, densely 

 flowered, the numerous stiff 

 branches ascending, with numer- 

 ous divaricate branchlets, mostly 

 on the lower side; spikelets 2.5 

 to 2.8 mm long, often curved at 

 the tip. % — Moist soil, Connecticut to Missouri, south to Georgia 

 and Texas (fig. 1525). 



150. Panicum longifolium Torr. (Fig. 1526.) Culms rather 

 slender, 35 to 80 cm tall, in dense tufts, usually surrounded by basal 

 leaves nearly half as long; sheaths usually villous near the summit; 

 ligule fimbriate-ciliate, 2 to 3 mm long; blades elongate, 2 to 5 mm 

 wide, pilose on the upper surface near the base; lateral panicles few 

 or none, the terminal 10 to 25 cm long, the branches slender, ascend- 



FiGrBE 1516.— Panicum amarulum. Two views of 

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



Figure 1517. — Distribution of 

 Panicum amarulum. 



Figure 1518.— Panicum tene- 

 rum. Two views of spikelet, 

 and floret, X 10. (Type.) 



Figure 1519.— Distribution of 

 Panicum tenerum. 



ing; spikelets 2.4 to 2.7 mm long. % — Moist sandy ground, 

 Coastal Plain, Massachusetts to Florida and Texas (fig. 1527). 



151. Panicum combsii Scribn. and Ball. (Fig. 1528.) Resembling 

 P. longifolium; sheaths glabrous or nearly so; ligule less than 1 mm 

 long; blades on the average shorter; spikelets 3 to 3.5 mm long, 

 acuminate. % — Margins of ponds and wet woods, Georgia to 

 Florida and Louisiana (fig. 1529). 



152. Panicum anceps Michx. (Fig. 1530.) Culms 50 to 100 cm 

 tall, with numerous scaly rhizomes; sheaths glabrous or pilose; blades 

 elongate, 4 to 12 mm wide, pilose above near the base; panicles 15 



