Part 3, 1915] POAC£AE 



223 



the nodes appressed-pubescent ; leaf-sheaths shorter than the internodes, striate, glabrous, or 

 pubescent along the margin toward the summit or the lower sparsely so throughout ; ligule about 

 1 mm. long; blades erect from the sheath but often spreading at the ends, 5-20 cm. long, 1-3 

 mm. wide, flat or drying subin volute, sparsely pilose on the upper surface, glabrous or sparingly 

 pubescent beneath; panicles exserted, 5-10 cm. long, nearly as wide, the few capillary branches 

 at first ascending, stiffly spreading at maturity, bearing a few short-pediceled spikelets toward 

 the ends; spikelets 2.1-2.5 mm. long, about 1 mm. wide; first glume about half the length of 

 the spikelet, acute, 5-nerved; second glume and sterile lemma 7-9-nerved; fruit 1.5-1.6 mm. 

 long, 0.9 mm. wide, elliptic. 



Type locality: Jamaica. 



Distribution: Bahamas and the West Indies. 



Illustrations: Trin. Ic. pi. 263; Contr. U. S. Nat. Herb. 15: /. 59. 



Panicum Bergii Arech. (Anal. Mus. Nac. Montevid. 1: 147. 1894), a South American 

 species with numerous leaves clustered at the base, hispid sheaths, involute blades, and very diffuse 

 panicles, a third or more the entire height of the plant, with verticillate lower branches, conspicu- 

 ously pilose in the axils, and short-pointed spikelets 2.2-2.6 mm. long, has been collected on ballast 

 at Mobile, Alabama, and at Galveston, Texas. 



36. Panicum filipes Scribn.; A. Heller, Bot. Expl. Texas 13. 



1895. 



Plants pale- green, in small dense tufts, erect or ascending, 30-80 cm. high; culms simple 

 or sparingly branching, stiff, glabrous except the appressed-pubescent nodes; leaf -sheaths short- 

 er than the internodes, glabrous or sparsely appressed-hispid toward the summit; ligule about 

 1.5 mm. long; blades thin, ascending or laxly spreading, 10-25 cm. long, 3-8 mm. wide, flat, 



glaucous and glabrous on the upper surface, glabrous beneath or very sparsely papillose- 

 hirsute; panicles exserted, usually equaled or exceeded by the uppermost blades, 7-25 cm. long, 

 about as wide, the distant branches spreading, the branchlets rather more numerous and the 

 spikelets usually longer-pediceled than in P. diffusum; spikelets 2-2.6 mm. long, about 1 mm. 

 wide; first glume about two thirds the length of the spikelet, acuminate, 3-5-nerved, second 

 glume and sterile lemma 5-7-nerved; fruit 1.5-1.7 mm. long, about 0.8 mm. wide, elliptic. 



Type locality: Corpus Christi, Texas. 



Distribution : Southern Texas. 



Illustrations: Bull. U. S. Dep. Agr. Agrost. 7: /. 50; Contr. U. S. Nat. Herb. 15: /. 60. 



37. Panicum Hallii Vasey, Bull. Torrey Club 11: 61. 1884. 



Plants rather glaucous-green, in small tufts, erect, 15-60 cm. high; culms simple or sparing- 

 ly branching from the lower nodes, glabrous except the appressed-pubescent nodes; leaves 

 commonly more or less crowded toward the base, the blades becoming curled or twisted, the 

 lower sheaths overlapping on the short internodes; leaf -sheaths sparsely papillose-hispid to 

 glabrous; ligule about 1.5 mm. long; blades erect or nearly so, 4-15 cm. long, 2-6 mm. wide, 

 flat, usually sparsely papillose-ciliate toward the base, otherwise glabrous or with a few long, 

 delicate hairs on the upper surface or sparingly papillose-hispid beneath, often with a thin, 

 cartilaginous, white margin, curling, with age, like shavings; panicles usually long-exserted 

 and much exceeding the leaves, 6-20 cm. long, rather narrowly flabellate in outline, the few 

 branches stiffly ascending, bearing short, appressed branchlets with approximate spikelets on 

 short, appressed pedicels; spikelets 3-3.7 mm. long, 1.1-1.5 mm. wide, turgid; first glume half 

 to two thirds the length of the spikelet, acuminate, 3-5-nerved ; second glume and sterile lemma 

 strongly 5-7-nerved; fruit 1.7-2 mm. long, 1-1.3 mm. wide, oval, obtuse, dark olive-brown at 

 maturity. 



Type locality: Austin, Texas. 



Distribution: Texas to Arizona, and south to central Mexico. 



Illustration: Contr. U. S. Nat. Herb. 15: /. 62. 



A- 



38. Panicum lepidulum Hitchc. & Chase, Contr. U. S. Nat. Herb. 15 : 



75. 1910. 



Plants solitary or in small tufts, erect, 25-70 cm. high; culms usually producing "one or 

 two erect branches from the lower nodes, sparsely papillose-pilose to merely scabrous toward 



