687 



MANUAL OF THE GRASSES OF THE UNITED STATES 



ly hispid, as much as 30 cm. long, 

 2 to 6 mm. wide; panicles relatively 

 few-flowered, oblong, narrow, 10 to 

 20 cm. long, about one-third as wide; 

 spikelets 3.1 to 3.5 mm. long. O 

 — Sandy, mostly damp soil, meadows 

 and open woods, eastern Canada and 



NeW York tO North Dakota, SOUth Figure 1039.— Ponietm philadelphicum. Two views 



to Florida and Texas; introduced in of spikeiet, and floret, x 10. (T yP ecoii.) 



130. Panicum philadelphicum 



Bernh. ex Trin. (Fig. 1039.) Plants 

 light yellowish green; culms slender, 

 usually erect, 15 to 50 cm. tall, 

 papillose : hispid to nearly glabrous, 

 more or less zigzag at base; blades 

 usually erect, 5 to 15 cm. long, 2 to 

 6 mm. wide, rather sparsely hirsute; 

 panicles 10 to 20 cm. long, few- 

 flowered, the branches solitary, rather 

 stiffly ascending, the axillary pulvini 

 hispid; spikelets 1.7 to 2 mm. long, 

 mostly in twos at the ends of the 

 branchlets. O — Dry open or 

 sandy ground, Connecticut to Minne- 

 sota, south to Georgia and Texas. 



Figure 1037. — Panicum flexile. Two views of spike- 

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



129. Panicum gattingeri Nash. 

 (Fig. 1038.) Culms at first erect, 

 soon decumbent and rooting at the 

 lower nodes, papillose-hispid, in ro- 

 bust specimens as much as 1 m. long; 

 blades 6 to 10 mm. wide, more or 

 less hispid or nearly glabrous ; panicles 

 numerous, terminal and axillary, 

 oval or elliptic in outline, the terminal 

 10 to 15 cm. long, the lateral smaller; 

 spikelets 2 mm. long. O — Open 

 ground and waste places, often a weed 

 in cultivated soil, New York and 

 Ontario to Minnesota, south to North 

 Carolina, Tennessee, and Arkansas. 



Figure 1040. — -Panicum lithophilum. Two views of 

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



131. Panicum lithophilum Swallen. 

 (Fig. 1040.) Culms 10 to 30 cm. tall, 

 in small tufts, glabrous or sparsely 

 hispid ; sheaths papillose-hispid ; 

 blades erect, 6 to 8 cm. long, 2 to 4 

 mm. wide, conspicuously tinged with 

 purple; panicles 7 to 15 cm. long, the 

 branches stiffly spreading, few-flow- 



Figure 1038. — Panicum gattingeri. Two views of 

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



Figure 1041. — Panicum tuckermani. Two views of 

 spikeiet, and floret, X 10. (Type coll.) 



