Part 3, 1915] POACEAE 271 



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

 the branches usually shorter than the primary internodes. 



Type locality: Ocmulgee River Swamp, below Macon, Georgia. 

 Distribution: North Carolina and Tennessee to Florida and Louisiana. 

 Illustration: Contr. U. S. Nat. Herb. 15: /. 285. 



167. Panicum flavovirens Nash, Bull. Torrey Club 26: 572. 1899. 



Vernal phase bright glossy-green ; culms densely tufted, very slender, ascending or spread- 

 ing, 15-30 cm. high, glabrous, more or less striate-angled, the lower leaves somewhat crowded 

 with overlapping sheaths, the upper distant; leaf-sheaths often minutely ciliate on the margin, 

 especially at the summit, otherwise glabrous or the lowermost obscurely pubescent; blades 

 ascending or spreading, 2-5 cm. long, 3-4 mm, wide, narrowed toward the rounded base, gla- 

 brous, or minutely puberulent beneathjthin, the cartilaginous margin inconspicuous or wanting; 

 panicles open, loosely few-flowered, the fiexuous branches spreading or the lower somewhat 

 reflexed; spikelets 1.3-1.4 mm. long, 0.7 mm. wide, elliptic, subacute, pubescent; first glume 

 one fourth to one third as long as the spikeletjsub acute; second glume hardly equaling the fruit 

 and sterile lemma; fruit 1.25 mm. long, 0.6 mm. wide, elliptic. 



Autumnal, phase spreading, the slender culms mostly decumbent or prostrate, branching 



from the lower and middle nodes, these early branches usually as long as the primary culms 



and loosely branching toward the summit, the short branchlets somewhat fascicled, the flat, 



reduced blades spreading, the ultimate panicles reduced but exserted; winter rosettes appearing 



early, usually conspicuous and persisting green during the following season as a dense tuft of 



sterile shoots with somewhat developed internodes, the blades thin, bright glossy-green, as 



much as 7 cm. long, 3-5 mm. wide. 



Type locality: Lake County, Florida. 



Distribution: North Carolina to Florida and Mississippi. 



Illustration: Contr. U. S. Nat. Herb. IS: /. 287. 



168. Panicum concinnius Hitchc. & Chase, Contr. U. S. Nat. Herb. 



15: 263. 1910. 



Panicum gracilicaule Nash, in Small, Fl. SE. U. S. 98. 1903. Not P. gracilicaule Rendle, 1899. 



Vernal phase bright-green; culms tufted, very slender, erect, glabrous, 12-50 cm. high; 

 nodes minutely puberulent; leaf -sheaths, except the lower, much shorter than the internodes 

 and less than half as long as the blades, puberulent on the margin, otherwise glabrous; ligule 

 about 0.5 mm. long; blades 5-7 cm. long, 5-6 mm. wide, erect or spreading, the margins nearly 

 parallel for most of their length, rounded at base, glabrous or obscurely puberulent beneath, 

 rather strongly nerved, faintly white-margined; panicles finally long-exserted, rather few- 

 flowered, 3-6 cm. long, about two thirds as wide, the branches ascending; spikelets 1.1 mm. 

 long, 0.7 mm. wide, obovate, obtuse, pubescent; first glume about one fifth the length of the 

 spikelet; second glume and sterile lemma slightly shorter than the fruit at maturity; fruit 1 mm. 



long, elliptic, acute. 



Autumnal phase radiate-spreading, late in the season bearing a few branches with some- 

 what reduced blades and small exserted panicles; winter rosette appearing early, the numerous, 

 rather firm blades bluish-green, about the size of those of the vernal culms. 



Type locality: Sand Mountain, Jackson County, Alabama. 

 Distribution: Georgia and Alabama. 

 Illustration: Contr. U. S. Nat. Herb. IS: /. 289. 



169. Panicum ensifolium Baldw.; Ell. Bot. S. C. & Ga. 1: 126. 1816. 



Panicum nitidum ensifolium Vasey, Bull. U. S. Dep. Agr. Bot. 8: 29. 1889. 



Panicum Brittonii Nash, Bull. Torrey Club 24: 194. 1897. 



Panicum Cuthbertii Ashe, Jour. Elisha Mitchell Soc. IS: 48. 1898. 



Panicum glabrissimum Ashe, Jour. Elisha Mitchell Soc. IS: 62. 1898. Not P. glaberrimum Steud. 



1854. 

 Panicum Shallotte Ashe, Jour. Elisha Mitchell Soc. 16: 84. 1900. 

 Panicum parvipaniculatum Ashe, Jour. Elisha Mitchell Soc. 16: 87. 1900. 



Vernal plants grayish-olive; culms cespitose, slender, erect or reclining, glabrous, 20-40 

 cm. high; leaf-sheaths glabrous, usually much shorter than the internodes; blades distant, often 



