96 POACEAE 



rather distant ; sheaths minutely pubescent, especially at the apex on the margins ; blades 

 widely spreading, firm, lanceolate, 2. 5-4 cm. long, 2-4 mm. wide, puberulent at the very 

 base on the upper surface : panicle 4-6 cm. long, broadly ovoid, its axis and spreading 

 branches puberulent: spikelets about 2.5 mm. long and 1.3 mm. wide, pubescent with 

 spreading hairs, the first scale i as long as the spikelet. 

 In dry sandy soil, peninsular Florida. Spring. 



54. Panicum 'Webberianuni Nash. Stems tufted, 2-4 dm. tall, erect or ascending, 

 rigid, branched : leaf-sheaths ciliate on the margin ; blades lanceolate, 4-9 cm. long, 7-14 

 mm. wide, sparsely ciliate at the base, usually erect : panicle ovate, 6-9 cm. long, its 

 branches spreading : spikelets elliptic or obovoid, 2.5 mm. long and about 1.3 mm. wide, 

 the apex of the fourth scale minutely pubescent. [P. Onslowense Ashe.] 



In pine lands, North Carolina to Florida. Spring and summer. 



55. Panicum dichotomum L. Light green, glabrous, or the lower nodes sometimes 

 barbed. Stems tufted, slender, 2-6 dm. tall, rarely taller, finally much branched about 

 the middle : primary leaves 4 or 5 ; sheaths shorter than the internodes ; blades widely 

 spreading, linear-lanceolate, the primary ones 4-8 cm. long, tisually 4—8 mm. wide, rarely 

 wider, those on the branches much smaller, often involute : panicle 4-8 cm. long, broadly 

 ovate, its branches usually ascending : spikelets rather few, 1.75-2 mm. long and 0.8-1 

 mm. wide, elliptic, glabrous. 



In dry soil, Connecticut and southern New York to Ohio, Georgia and Texas. Summer. 



56. Panicum Yadkin^nse Aslie. A glabrous perennial. Stems single, 8-10 dm. 

 tall, finally somewhat branched : leaves 5 or 6 ; sheaths nuicli shorter than the inter- 

 nodes, white-spotted ; blades ascending, lanceolate, acuminate, narrowed toward the base, 

 the primary ones 8-12 cm. long, 8-12 mm. wide : panicle 8-12 cm. long, broadly ovate or 

 oval, its branches long, ascending : spikelets about 2.3 mm. long and 1 mm. wide, elliptic, 

 acute, glabrous. 



In dry or sandy soil, Maryland to Georgia. Summer. 



57. Panicum barbulatum Miclix. Glabrous. Stems densely tufted, at first erect, 

 finally much branched and decumbent, the nodes strongly barbed with silky somewhat re- 

 flexed hairs : primary leaves 5-7 ; sheaths shorter than the internodes, ciliate on the over- 

 lapping margin ; primary leaf-blades spreading, sometimes somewhat reflexed, usually 6-10 

 cm. long, rarely shorter or longer, 8-15 mm. wide, lanceolate, the blades on the branches 

 much smaller : panicle finally nuich exserted, 7-11 cm. long, oval, its branches ascending : 

 spikelets 1.5-1.8 mm. long and about 0.8 mm. broad, elliptic, glabrous, or rarely minutely 

 and sparingly pubescent. [P. nitiduni var. barhulafmn (Michx. ■* Wood.] 



In wet places, New York to Illinois, Florida and Mississippi. Summer. 



58. Panicum nemopanthum Ashe. A tufted nearly glabrous perennial with barbed 

 nodes. Stems 3-5 dm. tall, erect : leaves 3 or 4 ; lowermost sheaths sometimes pubescent, 

 the uppermost often longer than the internodes ; blades spreading or ascending, lanceolate, 

 long-ciliate toward the somewhat narrowed base, 7-10 cm. long, 5-6 mm. wide, long- 

 acuminate : panicle 7-10 cm. long, broader tlian long, its branches wide-spreading, lax and 

 drooping : spikelets about 2.5 mm. long, a little exceeding 1 mm. broad, elliptic, glabrous. 



In woods. North Carolina. Spring. 



59. Panicum Mattamuskeetense Ashe. A tall sometimes tufted perennial with 

 barbed nodes. Stems 6-12 dm. tall, finally much l)ranclied : leaves 6 or 7 ; sheaths much 

 shorter than the internodes, usually considerably less than I as long, ciliate on the margins, 

 all but the lower ones glabrous ; blades spreading, 3-8 cm. long, 3-10 mm. wide, the lower- 

 most pubescent on both surfaces : panicle 6-10 dm. long, ovate : spikelets 2-2.5 mm. long 

 and about 1 mm. wide, elliptic, pubescent with sliort spreading hairs. 



In wet places. North Carolina. Summer. 



60. Panicum dnnulum Ashe. Stems 4-7 dm. tall, glabrous or sparingly pubescent, 

 finally branched, the nodes densely barbed with spreading hairs : leaves 4 or 5 ; sheaths 

 softly pubescent or sometimes the upper ones glabrous ; blades erect or nearly so, softly 

 pubescent on both surfaces, or the upper ones sometimes glabrous : panicle 4-lO cm. long, 

 its branches erect-ascending or ascending, rarely spreading : spikelets usually numerous, 

 1.8-2 mm. long and about 0.8 mm. wide, elliptic, strongly pubescent with spreading hairs. 



In dry rocky woods, Maryland to Georgia and Mississippi. Spring and summer. 



61. Panicum Edrlei Nash. Stems densely tufted, slender, 1-1.5 dm. tall, usually 

 with a few long weak scattered hairs below, finally branched, the nodes rather sparingly 

 barbed : leaves about 3 ; sheatlis rather sparsely hirsute witli long hairs ; blades ascending, 

 lanceolate, rather sparingly hirsute on both surfaces with long spreading hairs, 1-3 cm. 

 long, 2-6 mm. wide : panicle 2-3 cm. long, broadly ovate, its smooth branches spreading : 

 spikelets about 1.3 mm. long, 0.7 mm. wide, elli|)tic, glabrous. [P. (uistromontanum Ashe.^ 



In sandy soil, Tennessee and Alabama. Spring and summer. 



