Part 3, 1915] POACEAE 265 



Autumnal phase spreading-decumbent, the stiff culms rather loosely branching from the 

 middle and upper nodes, the ultimate branchlets crowded at the ends of the primary branches, 

 the reduced blades erect; winter leaves very firm, conspicuously ciliate; short culms with tufted 

 branches sometimes formed during the winter, the green bushy crown persistent at the base 

 of the tall vernal culms. 



Type locality: St. Marys, Georgia. 



Distribution: North Carolina to Florida and eastern Texas. 



Illustrations: Bull. U. S. Dep. Agr. Agrost. 17: /. 382; Contr. U. S. Nat. Herb. IS: /. 251. 



152. Panicum scoparioides Ashe, Jour. Elisha Mitchell Soc. IS: 53. 



1898. 



Vernal plants light-green; culms few to several in a tuft, 30-50 cm. high, slender, erect 

 or ascending, sparsely papillose-hispid with ascending hairs or nearly glabrous, the upper in- 

 ternodes shortened; nodes sometimes sparsely bearded; leaf-sheaths papillose-hispid to nearly 

 glabrous, the lower distant, the upper approximate, sometimes overlapping; ligule 2-3 mm. 

 long; blades firm, ascending, 7-10 cm. long, 6-10 mm. wide, tapering to the rounded base, 

 acuminate," appressed-pubescent beneath, sparsely hispid on the upper surface, usually a few 

 long hairs at the base ; panicles short-exserted, usually included at the base until maturity, 

 rather densely flowered, 4-7 cm. long, about two thirds as wide, the branches ascending; spike- 

 lets 2.2-2.3 mm. long, 1.2 mm. wide, obovate, obtuse or minutely pointed; first glume about 

 one fourth as long as the spikelet, subacute ; second glume and sterile lemma papillose-pubes- 

 cent, strongly nerved, subequal, as long as the fruit, the m argins at the summit usually inrolled, 

 the midnerve produced into an apiculus; fruit 1.9 mm. long, 1.1 mm. wide, elliptic. 



Autumnal phase erect or spreading; culms sparingly branching from the upper and middle 

 nodes after the maturity of the primary panicle, the stiff, reduced" blades involute-pointed, 

 much exceeding the panicles. 



Type locality: Centreville, Delaware. 



Distribution: Vermont to Delaware; Minnesota; Indiana. 



Illustrations: Contr. U. S. Nat. Herb. 15: /. 253; Britt. & Brown, 111. Fl. ed. 2./. 358. 



153. Panicum shastense Scribn. & Merr. Circ. U. S. Dep. Agr. 



Agrost. 35: 3. 1901. 



Vernal phase pale-green; culms tufted, 30-50 cm. high, slender, ascending from a more 

 or less geniculate base, papillose-pilose with ascending hairs; nodes short-bearded; leaf -sheaths 

 papillose-pilose, the hairs spreading; hairs of the ligule rather sparse, 2-3 mm. long; blades 

 ascending, 6-8 cm. long, 6-8 mm. wide, acuminate, scarcely narrowed toward the base, papil- 

 lose-pilose on the. under surface and with scattered long hairs on the upper ; panicles short- 

 exserted, 6-8 cm. long, about two thirds as wide, the axis pilose, the flexuous branches ascend- 

 ing; spikelets 2.4—2.6 mm. long, 1.2-1.4 mm. wide, obovate-oblong, obtuse, papillose-pubescent ; 

 first glume one fourth to one third as long as the spikelet, pointed; second glume scarcely equal- 

 ing the fruit and sterile lemma; fruit 2.1 mm. long, 1.3 mm. wide, elliptic. 



Autumnal phase spreading, with geniculate nodes and elongate, arched internodes, rather 



sparingly branching from the middle nodes, the primary branches elongate, the ultimate 



branchlets shorter than the internodes. 



Type locality: Castle Crag, California. 

 Distribution: Known only from the type locality. 

 Illustration: Contr. U. S. Nat. Herb. 15: /. 255. 



154. Panicum malacon Nash, Bull. Torrey Club 24: 197. 1897. 



Panicum sir icti folium Nash, Bull. Torrey Club 26: 579. 1899. 



Vernal phase erect or stiffly spreading, purplish olive-green; culms 30-50 cm. high, pubes- 

 cent with ascending -hairs, the nodes short-pubescent; leaf -sheaths pubescent like the culms, 

 sometimes sparsely so; blades stiffly ascending or somewhat spreading, 4-12 cm. long, 3-5 mm. 

 wide, rarely wider, sharply acuminate, scarcely narrowed toward the base, puberulent beneath, 

 puberulent or glabrous above, often villous at or near the margin or base with long hairs; 

 panicles 4-7 cm. long, three fourths to nearly as wide, few-flowered, the branches few, stiffly 

 ascending, the spikelets on long, stiff pedicels; spikelets 3-3.2 mm. long, 1.4-1.5 mm. wide, 



