5oo 



APPENDIX. 



[Vol. III. 



Panicum Addisonii Nash. Rigid Panicum. 

 (Fig. 267c) 

 P. Addisonii Nash, Bull. Torr. Club, 25: 83. 1898. 



Culms io'-is' tall, rigid, tufted, erect or decum- 

 bent at the base, at length much branched, the 

 branches erect, pubescent below with long nearly 

 appressed hairs which decrease in length toward 

 the summit where they are very short. Sheaths 

 often longer than the internodes, appressed-pubes- 

 cent, at least the lower ones; ligule a ring of hairs; 

 leaves erect, lanceolate, thickish, smooth and gla- 

 brous on both surfaces, rough on the margins, 

 acuminate, i'-tf long, i^ // ~3 // wide; panicle ovate 

 to oblong, %'-2)i' long, its branches spreading or 

 ascending; spikelets obovate, \" long, the first 

 scale acute or acutish, about one-half as long as 

 the spikelet, i-nerved, pubescent, second and third 

 scales 9-11-nerved, densely pubescent with long 

 spreading hairs. 



Sandy soil, southern New Jersey. May-June. 



[Vol. i: p. 121.] 25f. Panicum 



Atlanticum Nash. Atlantic Panicum. 



(Fig. 267f.) 



P. Atlanticum Nash, Bull. Torr. Club, 24: 346. 1897. 



Papillose-pilose with long white spreading hairs. 

 Culms tufted, at length branched, i2 / -20 / tall, erect 

 or ascending, a smooth ring below the nodes which 

 are barbed with spreading hairs; sheaths shorter 

 than the internodes; ligule a ring of hairs i // -2}i // 

 long; leaves erect, rigid, thickish, linear-lanceolate, 

 iX'-^long, 2 // -t ) }4 // wide, acuminate, 7-1 i-nerved, 

 middle leaves the longest; panicle i}4 / -2}4 / long, 

 \% , -2% / wide, the branches and their divisions 

 hispidulous; spikelets numerous, obovate, a little 

 over \" long, %' // wide, obtuse, the outer 3 scales 

 densely pubescent with short spreading hairs, the 

 first scale about one-half as long as the spikelet, 

 i-nerved, the second and third scales 9-nerved. 



Dry soil, New York to Virginia. June-Aug. 



[Vol. 1: p. 127.] 26a. Panicum 



linearifolium Scribn. Linear-leaved 



Panicum. (Fig. 268a.) 



Culms tufted, slender, erect, smooth and 

 glabrous, simple, 6 / -i6 / tall. Sheaths gla- 

 brous or pilose with long white hairs, longer 

 than the internodes; ligule a ring of short 

 hairs; leaves elongated, smooth or rough, 

 glabrous or more or less pilose, especially 

 upon the lower surface, 3 / -io / long, i // -2 // 

 wide, the uppermost leaf the longest and 

 often extending beyond the panicle; primary 

 panicle loose and open, often long-exserted, 

 \y 2 '-\' long, its branches ascending, second- 

 ary panicles small and contracted on very 

 short culms and partly concealed by the bases 

 of the long culms ; spikelets \"-i}i ,f long, 

 obtuse or acutish, pubescent with spreading 

 hairs. 



Dry soil, especially hillsides, New York and 

 New Jersey to Missouri. 



