282 NORTH AMERICAN FLORA [Volume 17 



195. Panicum mutabile Scribn. & Smith; Nash, in Small, Fl. SE. 



U. S. 103. 1903. 



Vernal plants blue-green, glaucous; culms solitary or few in a tuft, erect, 30-70 cm. high, 

 glabrous or rarely minutely pubescent ; leaf-sheaths much shorter than the internodes, glabrous 

 except the usually sparsely ciliate margin; ligule very short, membranaceous-fimbriate ; blades 

 horizontally spreading, 6-15 cm. long, 8-20 mm. wide, tapering to both ends, rather thin, 

 glabrous on both surfaces, ciliate on the margin toward the cordate base or the lower ciliate 

 nearly to the apex; panicles 7-15 cm. long, about as wide, very loosely few-flowered; spikelets 

 2.9-3 mm. long, 1.2 mm. wide, elliptic, minutely pointed, pubescent; first glume about one 

 third as long as the spikelet, subacute; second glume and sterile lemma equaling or slightly 

 exceeding the fruit; fruit 2.6 mm. long, 1.1 mm. wide, elliptic, subacute. 



Autumnal phase erect or reclining, sparingly branching from the middle and upper nodes, 

 the branches longer than the internodes, finally producing toward the ends fascicles of shortened 

 branchlets with somewhat reduced leaves. 



Type locality: Biloxi, Mississippi. 



Distribution: Virginia to Florida, and west to Mississippi. 



Illustrations: Contr. U. S. Nat. Herb. 15: /. 346; Britt. & Brown, 111. Fl. ed. 2./. 383. 



196. Panicum Joorii Vasey, Bull. U. S. Dep. Agr. Bot. 8: 31. 1889. 



Panicum leiophyllum Fourn. Mex. PL Gram. 20. 1886. Not P. leiophyllum Nees, 1829. 

 Panicum manatense Nash, Bull. Torrey Club 24: 42. 1897. 



Vernal phase rather pale grayish-green; culms in clumps of few to many, 20-55 cm. high, 

 slender, spreading or ascending from a decumbent base, glabrous or rarely puberulent, at least 

 the lower internodes purplish-red; leaf-sheaths shorter than the internodes, ciliate, otherwise 

 glabrous or rarely puberulent between the nerves; ligule nearly obsolete; blades ascending or 

 spreading, 6-15 cm., rarely 18 cm. long, 7-18 mm. wide, thin but firm, often subfalcate, acumi- 

 nate, narrowed toward the rounded base, usually ciliate at base, otherwise glabrous; panicles 

 short-exserted, 5-9 cm. long, about two thirds as wide, loosely flowered, the branches ascending 

 or spreading; spikelets 3-3.1 mm. long, 1.2-1.3 mm. wide, elliptic, abruptly short-pointed, 

 pubescent; first glume one third to two fifths as long as the spikelet, acute; second glume and 

 sterile lemma more or less pustulate-papillose between the nerves, the glume slightly shorter 

 than the usually involute-pointed sterile lemma; fruit 2.4 mm. long, 1.2 mm. wide, elliptic, 

 minutely umbonate. 



Autumnal phase widely spreading, bearing more or less divaricate branches from all the 

 nodes, these primary branches longer than the internodes and branching from all or from their 

 upper nodes, the ultimate branchlets in short, dense fascicles, the reduced blades ascending, 

 exceeding the numerous, small, partly included panicles; winter rosette a crown of a few short, 

 leafy, basal shoots, with evident internodes. 



Type locality : Louisiana. 



Distribution: Virginia to Florida and eastern Texas; Vera Cruz. 



Illustrations: Bull. U. S. Dep. Agr. Agrost. 17: /. 383; Contr. U. S. Nat. Herb. 15: /. 348. 



197. Panicum equilaterale Scribn. Bull. U. S. Dep. Agr. Agrost. 11: 



42. 1898. 



Panicum epilifolium Nash, Bull. Torrey Club 26: 571. 1899. 



Vernal plants glossy, grayish-green, in clumps of several to many culms, these 25-70 cm. 

 high, stiff and erect, glabrous or nearly so, including the nodes ; leaf -sheaths much shorter than 

 the elongate internodes, or the upper two approximate, glabrous except for the densely short- 

 ciliate margin; ligule nearly obsolete; blades firm, widely spreading or ascending, 6-17 cm. long, 

 6-14 mm. wide, very scabrous (the margins nearly parallel), often ciliate at the rounded or 

 subcordate base, acuminate, glabrous on both surfaces, often drying conduplicate ; panicles 



usually short-exserted, loosely flowered, 5-10 cm. long, two thirds to three fourths as wide, the 

 branches ascending; spikelets 3.2 mm. long, 1.3 mm. wide, obovate-elliptic, obscurely pointed, 

 pubescent; first glume half the length of the spikelet or more, rather remote, triangular, acute; 

 second glume and sterile lemma subequal, barely covering the fruit at maturity; fruit 2.6-2.7 

 mm. long, 1.25 mm. wide, elliptic, minutely umbonate. 



