28 



25. P. anceps, Mich. — See No. 56. 



26. P. laxuni Siv. of tliis group, common in the West Indies, is prob- 

 ably also in southern Florida, but I have seen no authentic specimens. 



27. P. hians. Ml.— Perennial, culms slender, smooth, 6 to 18 inches 

 high, simple, from slender, wiry, creeping root-stocks ; leaves linear, 3 

 to 5 inches long, 1 to 2 lines wide, smooth, erect; panicle rather 

 small, 3 too inches long, the slender, racemose branches 1 to 2 inches 

 long, erect- spreading, mostly single and distant, the lower third naked; 

 spikelets about 1 liue long, in small, nearly sessile, approximate clus- 

 ters, outer glumes ovate, acute, generally three-nerved, the lower one- 

 half as long as the spikelet, third glume longer than the second and 

 having a thick, rigid, obovate palet rather longer than its glume, and 

 spreading apart from it, hence probably the name Hans, from Ato, to 

 gape. 



North Carolina to Texas. 



28. P. ciliatissimum, Buclrf. — Culms procumbent and much branched, 

 often rooting at the joints, at first short-jointed and much condensed, 

 with leaves 1 to 1 J inches long, and the panicles short and invaginate, 

 becoming elongated, with long-exserted panicles (lateral and terminal) 

 which become lj to 2 inches long, narrow, with a few short, few-flow- 

 ered, appressed branches, and linear-lanceolate, acuminate leaves, 2 

 to 4 inches long, ciliate on the margins below, with sparsely ciliate and 

 hairy sheaths, the nodes white-woolly; spikelets ovate, acute, 2 lines 

 long, pubescent or villous; the lower glume lanceolate, acute, three- 

 nerved ; smooth, except at the base, two-thirds as long as the spikelet ; 

 second, eleven to thirteen nerved; pubescent to densely villous, with 

 a smooth, acute, hardened point; the third one, or flowering glume 

 of the sterile flower a little shorter than the second, five-nerved, ciliate 

 on the margins, its palet equally long, ovate, thin, the fertile flower one- 

 fourth to one-third shorter than the largest glume, obtusish, minutely 

 farrowed. 



Texas. 



Section- VII.— Eupanicum. 



29. P. Xanthophysum, Gray. — Culms erect, 1 to 2 feet high, simple 

 or branched near the base; leaves lanceolate, acuminate, 4 to inches 

 long, 5 to 10 lines wide, smooth except the scabrous margins, strongly 

 nine to eleven nerved, rather contracted at the ciliate, clasping base; 

 panicle long-exserted, 2 to 4 inches long, of a few simple, erect or 

 appressed, few-flowered branches; spikelets obovate, 1£ lines long, 

 minutely downy ; lower glume about half the length of the spikelet, 

 second and third about nine-nerved. 



Plant yellowish-green. Canada to Pennsylvania and Wisconsin. 



30. P. pedicellatum, Yascy.— Culms 1 to 2 feet high, slender, branching 

 below, smooth ; culm leaves 2 to 3 inches long, 2 to 3 lines wide, gradu- 

 ally tapering to an acute point, erect, somewhat rigid ; main panicle long- 

 exserted, the lateral ones less so, all small and few flowered, li to 2 



