HITCHCOCK AND CHASE—NORTH AMERICAN PANICUM. 263 
4 mm. wide, narrowed toward the rounded base, glabrous, or minutely puberulent 
beneath, thin, the cartilaginous margin inconspicuous or wanting; panicles open, 
loosely few-flowered, the flexuous branches spreading or the lower somewhat reflexed ; 
spikelets 1.3 to 1.4 mm. long, 0.7 mm. wide, elliptic, subacute, pubescent; first glume 
one-fourth to one-third as long as the spikelet, subacute; second glume hardly equal- 
ing the fruit and sterile lemma; fruit 1.25 mm. long, 0.6 mm. wide, elliptic. 
Autumnal form 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 to 5 mm. 
wide. 
This species is allied to P. albomarginatum and P. trifolium, from both of which it is 
distinguished by the thin bright-green glossy blades, which are scarcely or not at all 
white-margined. The mode of branch- 
ing is like that of P. albomarginatum, 
but looser, the thin blades spreading, 
the small panicles exserted. 
DISTRIBUTION. 
Moist shady or mucky soil, North 
Carolina to Florida and Mississippi. 
NortH Carouina: Wilmington, 
Hitchcock 337. 
SoutH CaRroLina: Orangeburg, 
Hitchcock 25. 
Fioripa: Jacksonville, Combs 34; Lake City, Combs 98 in part; Pensacola, Combs 
539; Milton, Chase 4310, 4322; Chipley, Combs 585; Sanford, Hitchcock 7674; 
Eustis, Chase 4059, Nash 2061; Grasmere, Combs 1088; Tampa, Combs 1394; 
Lemon Bay, Tracy 7188 in part; Myers, Hitchcock 9014, 905. 
Mississippi: Biloxi, Tracy 2027. 
Fic, 288.—Distribution of P. flavovirens. 
156. Panicum concinnius nom. nov. 
Panicum gracilicaule Nash in Small, Fl. Southeast. U. 8. 98. 1903, not Rendle, 
1899. On page 1327 in the list of new genera and species, the following citation is 
given: ‘‘Type, Sand Mt., Jackson Co., Ala., Harbison, no. 2415, 1900, in Herb. N. 
Y. B. G.”’ This specimen, in the herbarium of the New York 
Botanical Garden, from the Biltmore Herbarium, is the vernal form, 
the panicles immature. 
DESCRIPTION. 
Vernal form bright green; culms tufted, very slender, erect, gla- 
Fig. 289.—P.concin-  hrous, 12 to 50 cm. high, nodes minutely puberulent; sheaths, ex- 
nits. From type cept the lower, much shorter than the internodes and less than half 
specimen of P. . ; 
gracilicaule Nash. 98 long as the blades, puberulent on the margin, otherwise glabrous; 
ligules about 0.5mm. long; blades 5 to 7 cm. long, 5 to6 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 to 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; sec- 
