254 NORTH AMERICAN FLORA [Volume 17 



123. Panicum yadkinense Ashe, Jour. EHsha Mitchell Soc. 16: 85. 



1900. 



? Panicum dichotomum curvatum Torr. Fl. U. S. 145. 1824. 

 ? Panicum Dumus Desv. Opusc. 88. 1831. 



Panicum maculatum Ashe, Jour. EHsha Mitchell Soc. 15: 44. 1898. Not P. maculatum Aubl. 

 1775. 



Vernal phase similar to that of P. dichotomum, but culms taller and stouter, sometimes 

 1 meter high; leaf -sheaths usually bearing pale, glandular spots; blades 9-13 cm. long, 8-11 

 mm. wide; panicles about 10-12 cm. long, about three fourths as wide, the long lower branches 

 ascending; spikelets 2.3-2.5 mm. long, 1 mm. wide, elliptic to subfusiform, pointed, glabrous; 

 first glume about one third the length of the spikelet, usually blunt ; second glume and sterile 

 lemma rather faintly nerved, equal, exceeding the fruit and forming a slight point beyond it; 

 fruit 1.9 mm. long, 0.9 mm. wide, elliptic, subobtuse. 



Autumnal phase erect or leaning, loosely branching from the middle nodes, the blades 



i 



smaller but not conspicuously reduced. 



Type locality: Raleigh, North Carolina. 



Distribution: Pennsylvania to Illinois, and south to Georgia and Louisiana; southern Mexico, 



Illustrations: Contr. U. S. Nat. Herb. 15: /. 195; Britt. & Brown, 111. Fl. ed. 2./. 347, 



124. Panicum roanokense Ashe, Jour. EHsha Mitchell Soc. 15: 44. 



1898. 



Panicum curtivaginum Ashe, Jour. EHsha Mitchell Soc. 16: 85. 1900. 



Vernal phase cespitose, somewhat glaucous olive-green; culms erect or ascending, 50-100 

 cm. high; leaf -sheaths half as long as the internodes or less, glabrous, or the lowermost some- 

 times sparsely pubescent; blades at first stiffly erect, later ascending or spreading, 6-9 cm. 

 long, 3-8 mm. wide, tapering to both ends, glabrous or with a few hairs around the base; 

 panicles 4-8 cm. long, scarcely as wide, the branches spreading; spikelets 2 mm. long, 1 mm. 

 wide, ellipsoid-obovoid, very turgid, glabrous; first glume about one third the length of the 

 spikelet; second glume and sterile lemma strongly nerved, subequal, the glume rather conspicu- 

 ously purple- tinged at base, scarcely covering the fruit at maturity; fruit 1.6 mm. long, 0.9 

 mm. wide, ellipsoid. 



Autumnal phase erect or decumbent, branching at the mid die andupper nodes, the branches 

 numerous but not in tufts, the primary internodes elongating and becoming arched about the 

 time the branches appear, the reduced blades more or less involute, not exceeding the 1.5-4 cm. 

 long panicles; basal blades firm, erect, often as much as 5 or 6 cm. long. 



Type locality: Roanoke Island, North Carolina. 



Distribution: Virginia to Florida, and west to eastern Texas; Jamaica. 



Illustration: Contr. U. S. Nat. Herb. 15: /. 197. 



125. Panicum caerulescens Hack.; Hitchc. Contr. U. S. Nat. Herb. 



12: 219. 1909. 



Vernal phase similar to that of P. roanokense; culms more slender, rarely more than 75 

 cm. high; blades ascending or spreading, commonly purplish beneath, 5-8 cm. long, 4—7 mm. 

 wide, the margins nearly parallel for two thirds their length; panicles usually short-exserted, 

 3-7 cm. long, half as wide or less, the branches narrowly ascending; spikelets 1.5-1.6 mm. long, 

 0.9 mm. wide, obovoid, blunt, very turgid, glabrous; first glume about one third the length of 

 the spikelets ; second glume and sterile lemma subequal, the glume scarcely as long as the fruit 

 at maturity; fruit 1.4 mm. long, 0.8 mm. wide, ellipsoid. 



Autumnal phase erect or leaning, sometimes decumbent at base, producing short, densely 

 fascicled branches at the middle and upper nodes, these tufts scarcely as long as the primary 

 internodes, the reduced blades ascending, more or less involute, the reduced panicles with a 

 few long-pediceled spikelets. 



Type locality : Miami, Florida. 



Distribution: New Jersey to Florida, and west to southern Mississippi; Bahamas; Cuba. 



Illustration: Contr. U. S. Nat. Herb. 15: /. 199. 



