-GENUS 17. 



GRASS FAMILY. 



59. Panicum tsugetorum Nash. Hemlock Panic- 

 grass. Fig. 369. 



P. tsugetorum Nash, Bull. Torr. Club, 25: 86. 1898. 



Culms and sheaths pubescent with short appressed 

 or ascending hairs intermixed toward the base with 

 longer ones. Culms tufted, ii or less tall, somewhat 

 slender, at length much branched and decumbent or 

 prostrate ; sheath shorter than the internodes ; ligule 

 a ring of hairs about $" long; blades erect or ascend- 

 ing, firm, lanceolate, 5-7-nerved, minutely appressed- 

 pubescent beneath, smooth and glabrous above, or the 

 upper primary leaves sometimes with a few long erect 

 hairs, the primary leaves ii'-3' long, zV-4" wide, those 

 on the branches smaller and partly concealing the 

 small panicles; primary panicles broadly ovate, ii'-2i' 

 long, the branches spreading-ascending; spikelets 

 broadly obovate, about I" long, the outer 3 scales 

 pubescent, with short spreading hairs. 



Dry soil in woods, Maine to Virginia, Illinois and Ten- 

 nessee. 



60. Panicum Nashianum Scribn. Xash's 

 Panic-grass. Fig. 370. 



Panicum Nashianum Scribn. Bull. U. S. Dept. Agric. 



Div. Agrost. 7: 79. 1897. 

 P. patulum Hitchc. Rhodora, 8: 209. 1906. 



Culms tufted, glabrous or puberulent, slender, 

 6'-is' tall, at length much branched. Sheaths 

 glabrous, or the lower pubescent, the primary 

 about one-third as long as the internodes, those 

 on the branches overlapping ; ligule a short sca- 

 rious ring; blades erect or ascending, lanceo- 

 late, acuminate, smooth and glabrous, ciliate, at 

 least at the base, 3'-2' long, i"-2j" wide, the 

 leaves of the branches smaller; primary panicle 

 i '-2' long, the branches widely spreading; spike- 

 lets about i" long, obovate, the first scale i-nerved, 

 the second and third scales 7-nerved, densely 

 pubescent with short spreading hairs. 



Pine lands, Virginia to Florida and Mississippi ; 

 also in the West Indies. March-July. 



61. Panicum Liebergii (Vasey) Scribn. Lie- 

 berg's Panic-grass. Fig. 371. 



Panicum scoparinm Lam. var. Liebergii Vasey, Bull. U. 



5. Dept. Agric. Div. Bot. 8: 32. 1889. 



P. Liebergii Scribn. Bull. U. S. Dept. Agr. Agrost. 8 : 



6. 1889. 



Culms erect, slender, glabrous, roughish, espe- 

 cially near the nodes, l-2 tall, at length branched. 

 Sheaths papillose-hirsute with spreading hairs, usu- 

 ally longer than the internodes; ligule a short sca- 

 rious ciliolate ring; blades erect or ascending, lan- 

 ceolate, 2'-4' long, 3"-6" wide, acuminate at the 

 apex, rounded at the partly clasping base, papillose- 

 hispid beneath and sometimes sparingly so on the 

 rough upper surface; panicle oblong, 2'-4' long, its 

 branches erect or ascending; spikelets ii"-2" long, 

 oval, the outer three scales papillose-hirsute with 

 long spreading hairs, the first scale about one-half 

 as long as the spikelet, ovate, acute, i-3-nerved, the 

 second and third scales broadly oval when spread 

 out, 7-9-nerved. 



Dry soil, western New York to Manitoba and Kansas. 

 June-July. 



