MANUAL OF THE GRASSES OF THE UNITED STATES 663 



66. Panicum deamii Hitchc. and 

 Chase. (Fig. 975.) Vernal phase yel- 

 lowish green; culms 25 to 35 cm. tall, 

 erect or ascending, papillose-pilose; 

 sheaths papillose-villous, densely so 

 at base and summit; blades suberect, 

 8 to 15 cm. long, 4 to 6 mm. wide, 

 sparsely villous on the upper surface, 

 appressed-pilose beneath; panicle 

 rather short-exserted, 6 to 10 cm. 

 long, the branches ascending; spike- 

 lets 2.8 to 2.9 mm. long, pilose. Au- 

 tumnal Culms branching from the Figure 977.— Panicum addisoni. Two views of spike- 

 middle and upper nodes, forming a let ' and floret - x 10 - (Type) 

 somewhat bushy summit, the culms surfacej pubescent or glabrous be- 

 sprawlmg. 91 --Sand dunes and neath; panicle 2 to 6 cm. long, more 

 sandy woods, northern Indiana and den sely flowered than in P. common- 

 lowa " sianum; spikelets about 2 mm. long. 



Autumnal culms more or less spread- 

 ing, rather freely branching from all 

 the nodes, the branches appressed. 

 % — Sand barrens, Coastal Plain, 

 Massachusetts to South Carolina ; In- 

 diana. Closely approaching P. com- 

 monsianum but having smaller spike- 

 lets. 



69. Panicum wilmingtonense Ashe. 

 (Fig. 978.) Vernal phase bluish green, 

 culms solitary or in small tufts, slen- 

 der, erect from an ascending base, 20 



Figure 976. — Panicum commonsianum. Two views of 

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



67. Panicum commonsianum Ashe. 

 (Fig. 976.) Vernal phase greenish 

 olive, drying brownish; culms and 

 sheaths appressed-pilose, the culms 20 

 to 50 cm. tall, ascending or spread- 

 ing, appres ed-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. % — Dunes and sandy 

 woods near the coast, Massachusetts 

 to northern Florida and Alabama. 



68. Panicum addisoni Nash. (Fig. 

 977.) Vernal phase similar to that of 

 P. commonsianum; culms usually less 

 than 40 cm. tall, appressed-pilose be- 

 low, puberulent above; sheaths 

 sparsely ascending-pilose, blades 3 to 

 6 mm. wide, glabrous on the upper 



Figure 978. — Panicum wilmingtonense. Two views of 

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



to 40 cm. tall, pilose with soft ascend- 

 ing hairs; sheaths pubescent like the 

 culms, densely villous-ciliate at the 

 summit; blades 3 to 7 cm. long, gla- 

 brous on the upper surface, softly pu- 

 bescent 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. 01 — Sandy 

 woods, North Carolina, South Caro- 

 lina, and Alabama, rare. 



