MANUAL OF THE GRASSES OF THE UNITED STATES 



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the culms 20 to 50 cm tall, ascending or spreading, appressed-pilose ; 

 blades 4 to 7 mm wide, broadest near the rounded base, glabrous or 

 nearly so on the upper surface, strigose or glabrous beneath; panicle 

 4 to 8 cm long, the branches stiffly spreading; spikelets 2.2 to 2.4 mm 

 long. Autumnal culms branching from the middle and upper nodes, 

 finally spreading or prostrate in mats. 21 — Dunes and sandy 

 woods near the coast, Massachusetts to northern Florida (fig. 1384). 

 65. Panicum addisoni Nash. (Fig. 1385.) Vernal phase similar 

 to that of P. commonsianum; culms usually less than 40 cm tall, 

 appressed-pilose below, puberulent above; sheaths sparsely ascending- 



Figure 1383. — Panicum commonsianum. 

 Two views of spikelet, and floret, X 10. 

 (Type.) 



Figure 1384.— Distribution of 

 Panicum commonsianum. 



pilose, blades 3 to 6 mm wide, glabrous on the upper surface, pubescent 

 or glabrous beneath; panicle 2 to 6 cm long, more densely flowered 

 than in P. commonsianum; spikelets about 2 nun long. Autumnal 

 culms more or less spreading, rather freely branching from all the 

 nodes, the branches appressed. % — Sand barrens, Coastal Plain, 

 Massachusetts to South Carolina; Indiana (fig. 1386). Closely 

 approaching P. commonsianum but having smaller spikelets. 



66. Panicum wilmingtonense Ashe. (Fig. 1387.) Vernal phase 

 bluish green, culms solitary or in small tufts, slender, erect from an 

 ascending base, 20 to 40 cm tall, pilose with soft ascending hairs; 



Figure 1386.— Distribution of 

 Panicum addisoni. 



Figure 1385.— Panicum addisoni. Two 

 views of spikelet, and floret, X 10. 

 (Type.) 



sheaths pubescent like the culms, densely villous-ciliate at the summit; 

 blades 3 to 7 mm long, glabrous on the upper surface, softly pubescent 

 or nearly glabrous beneath, strongly ciliate near the base, the thick 

 cartilaginous margin white when dry; panicle 5 to 8 cm long; spikelets 

 2 mm long. Autumnal culms spreading, branching from the middle 

 and upper nodes. % —Sandy woods, North Carolina, South 

 Carolina, and Alabama, rare. 



67. Panicum tsugetorum Nash. (Fig. 1388.) Vernal phase 

 usually pale bluish green; culms 30 to 50 cm tall, spreading or ascend- 

 ing, the lower nodes often geniculate, densely appressed-pubescent 

 with short crisp hairs, long hairs more or less intermixed; sheaths 



