102 POACEAE 



rather distantly inserted on the rachilla, the first scale about 2 as long as the spikelet, the 

 second and third scales densely pubescent with short spreading hairs. 

 In dry ground, Texas. Spring and summer. 



103. Panicum mdlacon Nash. A densely tufted usually purplish perennial, with; 

 the stem and slieaths strongly hirsute with ascending or nearly erect hairs. Stems 3-5 dm. 

 tall, finally nuich branciied : sheaths shorter than the internodes ; blades erect, acuminate, 

 softly pubescent on both surfaces with short hairs : panicle 7-10 cm. long, oval, its branches 

 ascending: spikelets 3.5 ram. long and about 1.5 mm. broad, obovoid, densely pubescent 

 with rather long spreading hairs, the first scale fully j as long as the spikelet and 5-nerved. 



In dry sandy soil, v>eninsular Florida. Spring. 



104. Panicum Helleri Nash. Stems tufted, 2-4 dm. tall, finally branched, appres.sed-^ 

 pubescent below with long hairs, the nodes sparingly barbed : leaves 5 ; sheaths ciliate on 

 the exterior margin, bearing between the prominent nerves scattered papillae from which 

 sometimes arise stiff hairs, the internerves of all but the upper sheaths minutely pubescent ; 

 blades broadly lanceolate, thin, sparsely ciliate at the rounded base, the primary ones 6-8 

 cm. long, 6-12 mm. wide : panicle usually included at the base, 6-8 cm. long, its branches 

 ascending: spikelets 3.25-3.5 ram. long and about 1.5 mm. wide, ellipsoid or somewhat 

 obovoid, pubescent toward the base with a few scattered hairs. 



On stony wooded iiillsides, southern Texas. Spring. 



105. Panicum scabriiisculum Ell. Stems glabrous or pubescent, 8-14 dm. long, 

 erect, sometimes rooting at the lower nodes, finally branched : leaves 6-8 ; sheaths glabrous 

 or pubescent ; blades erect or ascending, linear-lanceolate, glabrous, 1-2 dm. long, S-12 

 mm. wide : panicle 1-2 dm. long, broadly ovoid, its branches spreading or ascending : 

 spikelets lanceolate, glabrous, 2-2.3 mm. long and 1 nun. broad, ovate to ovate-lanceolate, 

 acute, the nerves of the flowering scale very prorainent. 



In swampy places and ponds, Virginia to Florida and Texas. Spring and summer. 



106. Panicum scoparium Lara. Stems erect, 6-12 dm. tall, simple, finally nuich 

 branched above, villous : leaf-sheaths villous ; blades softly pubescent, those on the main 

 stem 10-18 cm. long, 10-16 mm. wide, distant, those on the brandies 2.5-6.5 cm. long, 4-10 

 mm. wide, crowded : primary panicle 7-15 cm. long, ovoid, its branches ascending, the 

 secondary panicles much smaller : spikelets ovoid to oval, about 2.5 nun. long, pubescent. 

 [P. viscidum Ell.] 



In moist soil, New Jersey to Indiana, the Indian Territory, Florida and Texas. Summer. 



107. Panicum equilaterale Scribn. A tufted nearly glabrous perennial. Stems 

 4-8 dm. tall, finally branciied, the branchlets crowded at the end of the branches : primary 

 leaves 4 or 5 ; sheaths ciliate on the margins, shorter than the internodes : primary blades 

 spreading, elongated, linear to linear-lanceolate, 8-18 cm. long, 7-15 mm. wide, those on 

 the branches much smaller but similar in shape : primary panicle 7-9 cm. long, broadly- 

 ovate, its branches somewhat ascending : spikelets about 3.5 mm. long and about 1.3 mm. 

 wide, elliptic, somewhat acute, pubescent with short spreading hairs. 



In dry soil, peninsular Florida. Summer. 



108. Panicum Ashei (i. Pearson. Stems tufted, 2-4 dm. tall, erect, usually spar- 

 ingly branched, rarely much branched and prostrate, puberulent : leaves 3 or 4; sheaths 

 usually less than 5- as long as the internodes, ciliate on the overlapping margin ; 

 blades usually erect or ascending, sometimes spreading, lanceolate, sparsely ciliate at the 

 base with long hairs, usually 5-8 cm. long, rarely longer, 6-10 mm. wide, occasionally 

 broader, a little cordate at the base, the upper blades about the same length, the lower ones 

 shorter, the early basal blades ciliate : panicle 5-7 cm. long, its branches ascending : spike- 

 lets about 2.3 mm. long and about 1 mm. wide, elliptic, pubescent with rather long ascend- 

 ing hairs. 



In dry woods, southern Connecticut and New York to Tennessee and Georgia ; also in Missouri 

 Summer. 



109. Panicum ovale Ell. Stems tufted, 3-7 dm. tall, villous, finally somewhat 

 branciied, the branches divergent : primary leaves usually 3-5 ; sheaths shorter than the 

 internodes, softly pubescent, ciliate on the margin ; upper blades ovate-lanceolate, crowded 

 and clasping at the base, pubescent on both surfaces, ciliate on the margins, the primary 

 ones 5-10 cm. long, 1-2.5 cm. wide: primary panicle 7-12 cm. long, oval, its branches as- 

 cending: spikelets 2.5-3 mm. long and about 1 mm. wide, rarely larger, pubescent with 

 spreading hairs. \_P. com')nelinaefolium Ashe. P. Currani Ashe.^ 



In dry soil. North Carolina to Florida and Louisiana. Spring and summer. 



110. Panicum Manatense Nash. Stems 2-4 dm. long, finally decumbent and much 

 branched : leaf-sheaths ciliate on the margin ; blades erect or nearly so, lanceolate, 3-9 



