Genus 17. 



GRASS FAMILY. 



59. Panicum tsugetdrum 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, i$° or less tall, somewhat 

 slender, at length much branched and decumbent or 

 prostrate; sheath shorter than the internodes; ligule 

 a ring of hairs about i" 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 1F-3' long, 2i"-4" wide, those 

 on the branches smaller and partly concealing the 

 small panicles; primary panicles broadly ovate, \\'-2.Y 

 long, the branches spreading-ascending ; spikelets 

 broadly obovate, about {" 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. Nash'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'-i5' 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, ¥-2' long, i"-zi" wide, the 

 leaves of the branches smaller; primary panicle 

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

 lets about 1" 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 scoparium 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, i°-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 i4"-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, 1-3-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. 



