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. 21 Borders of streams and 

 ponds and in wet places, Coastal 

 Plain, Pennsylvania to Florida 

 and Texas; West Indies (fig. 

 1523). 



149. Panicum stipitatum Nash. 

 (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 



rm tVio IrkAxra-p cirlo* crnlrolo+G 9 ^ FIGURE 1516. Panicum amarulum. Two views of 

 On tne lOWer Side, SplKeietS Z.5 spikelet, and floret, X 10. (Type.) 



to 2.8 mm long, often curved at 



the tip. 91 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- 



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. Qi 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. 01 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 



