232 NORTH AMERICAN FLORA [Volume 17 



mm. wide (occasional specimens with smaller spikelets) ; first glume one third to half the length 

 of the spikelet, acute ; second glume and sterile lemma subequal, forming a beak beyond the 

 fruit, the tips open at maturity; fruit 2-2.2 mm. long, about 1 mm. wide. 



Type locality: Carolina. 



Distribution: New Jersey to Kansas, and south to Florida and Texas. 



Illustrations : Vasey, Agr. Grasses U. S. pi. 10; ed. 2. pi. 18; Bull. Tenn. Exp. Sta. 7: pi. 

 8,f. 32; Contr. U. S. Nat. Herb. 15: /. 102; Bull. U. S. Dep. Agr. Agrost. 7: /. 53; Britt. & Brown, 

 111. Fl./. 248; ed.2.f.324. 



61. Panicum rhizomatum Hitchc. & Chase, Contr. U. S. Nat. Herb. 



15: 109. 1910. 



Plants like P. anceps in habit, the culms less robust, the scaly rhizomes slender and more 

 numerous ; leaves more or less clustered toward the base, the sheaths, except the lowermost, 

 shorter than the internodes, densely to sparsely villous along the margin and toward the sum- 

 mit, a dense ring of pubescence at the juncture with the blade; ligule nearly obsolete; blades 

 erect or the lower commonly spreading, 1 0-40 cm. long (usually not more than 30 cm.), 5-10 mm. 

 wide, pubescent on both surfaces or sometimes glabrous except on the upper surface toward 

 the base; terminal panicles long-exserted, the usually numerous smaller axillary ones short- 

 peduncled or partially included, 10-25 cm. long, usually less than one third as wide, more or 

 less contracted and densely flowered, rather more compound than in P. anceps, the distant 

 primary branches ascending, bearing numerous branchlets 1-3 cm. long, these with appressed, 

 short, approximate branchlets, with crowded spikelets set obliquely on their short, appressed 

 pedicels as in P. anceps, but hardly at all secund; spikelets 2.4—2.8 mm. long, about 1 mm. 

 wide ; first glume one third to scarcely half as long as the spikelet, acute ; second glume and 

 sterile lemma subequal, beaked as in P. anceps but less strongly so, little exceeding the fruit; 

 fruit 1.9 mm. long, 0.9 mm. wide. 



Type locality: Orangeburg, South Carolina. 

 Distribution : Virginia to Florida, and west to Texas. 

 Illustration : Contr. U. S. Nat. Herb. 15: /. 104. 



62. Panicum ineptum Hitchc. & Chase, Contr. U. S. Nat. Herb. 17: 



509. 1915. 



Plants perennial (?); culms slender, apparently ascending, probably 50 cm. long or more, 

 slender, striate-fluted, glabrous or the upper internodes sparsely pilose, producing nearly 

 simple branches as much as 25 cm. long; nodes retrorsely pubescent; leaf-sheaths loose, shorter 

 than the internodes, pilose, the margins densely ciliate; Hgule ciliate, about 0.5 mm. long; 

 blades spreading, flat, 3-6 mm. wide, tapering from the truncate base to an acuminate apex, 

 softly pilose on both surfaces ; panicles terminal, those of the branches short-exserted, 3-5 cm. 

 long, consisting of few to several short, spreading, densely flowered branches, remote along the 

 slender pilose axis, the branches 4-6 mm. long, bearing 1-8 subsessile spikelets, the rachis 

 pilose; spikelets 2.5-2.7 mm. long, 1.1 mm. wide, blunt; first glume about half as long as the 

 spikelet, 3-nerved, obtuse, pubescent; second glume and sterile lemma equal, inflated, much 

 larger than the fruit, the glume gibbous in the middle, 7-nerved, pubescent, the sterile lemma 

 3-nerved, glabrous, enclosing a membranaceous palea; fruit 1.6 mm. long, 0.9 mm. wide, 

 elliptic, smooth and shining, the lemma strongly convex. 



Type locality: Santo Domingo. 



Distribution: Known only from the type specimen. 



Illustration: Contr. U. S. Nat. Herb. 17: /. 98. 



63. Panicum longum Hitchc. & Chase, Contr. U. S. Nat. Herb. 15: 



111. 1910. 



Panicum munitum Trin.; Steud. Nom. Bot. ed. 2. 2: 260, hyponym. 1841. 



Panicum pilosum macranthum Scribn. Circ. U. S. Dept. Agr. Agrost. 19: 1. 1900. Not P. macran- 

 thum Trin. 1825. 



Plants perennial, ascending or spreading from a more or less geniculate base; culms rather 

 robust, 1.2-2 meters long, simple or sparingly branching from the lower nodes, glabrous, the 

 nodes glabrous; leaf-sheaths nearly as long as the internodes or overlapping, papillose or 



