MANUAL OF THE GKASSES OF THE UNITED STATES 



653 



the stiff branches erect or nearly so; spikelets 3.7 to 4 mm long, blunt, 

 pubescent. Autumnal phase erect or ascending, branching from the 

 second and third nodes, the branches erect, mostly simple. 01 

 Sandy or gravelly soil, Quebec to Manitoba, south to Pennsylvania 

 and Minnesota (fig. 1442). 



FIGURE 1440. Distribution of 

 Panicum leibergii. 



FIGURE 1441. Panicum xanthophysum. Two views of spikelet, and 

 floret, X 10. (Type.) 



14. Pedicellata. Culms slender from a knotted crown; sheaths 

 papillose-hirsute; ligules about 1 mm long; blades long-ciliate 

 at least toward base; spikelets attenuate at base, 7- to 9-nerved, 

 papillose-pubescent. Autumnal culms freely branching, the 



branches appearing before the matu- 

 rity of the primary panicle; no dis- 

 tinct winter rosette formed. 



97. Panicum pedicellatum Vasey. 

 (Fig. 1443.) Vernal culms erect or ascend- 

 ing, 20 to 50 cm tall, usually ascending- 

 hirsute at least below; blades 5 to 9 cm 

 long, 3 to 6 mm wide, glabrous or some- 

 times minutely hispid ; panicle 3 to 6 cm 

 long; spikelets 3.5 



to 3.7 mm long, 

 elliptic; first 

 glume about half 

 as long as the 

 spikelet, acute, the 

 second shorter 

 than the fruit. 

 Autumnal culms 



erect or leaning, branching from all but 

 the uppermost nodes, the branches spread- 

 ing. 01 Dry woods and prairies, 

 central and southern Texas. 



98. Panicum nod a turn Hitchc. and 

 FIGURE i443.-panfctM pedicellatum. Chase. (Fig. 1444.) Vernal culms tufted, 



flo?et!'x X io! ;t 5ienerTex f ) Spikelet ' "^ ascending or spreading, hard and wiry, 



25 to 35 cm tall, finely papillose, crisp- 



puberulent; blades firm, ascending, 3 to 5 cm long, 3 to 6 mm wide, 

 puberulent on both surfaces; panicle 4 to 5 cm long, few-flowered; 

 spikelets 4 mm long, pyriform. Autumnal culms widely geniculate- 

 decumbent, branching from all but the uppermost node, the branches 

 somewhat divaricate, the nodes of the main culm swollen. 01 

 Oak woods in sand dunes, southern Texas and northern Mexico. 



FIGURE 1442. Distribution of 

 Panicum xanthophysum. 



