POACEAE 103 



cm. long, 7-15 mm. wide, sparsely ciliate at the base : panicle 4-6 cm. long, its branches 

 ascending : spikelets elliptic, about 3 mm. long and 1.3 mm. wide, very acute, strongly 

 pubescent with spreading hairs. 



In hammock land, southern peninsular Florida. Summer. 



111. Panicum commutatum E. & S. Stems tufted, glabrous, erect, 3-6 dm. tall, 

 finally rather sparingly branched : leaves 3 or 4 ; sheaths glabrous, ciliate on the margin ; 

 blades ciliate on the margin, otherwise glabrous, cordate and clasping at the base, those on 

 the stem larger than the basal ones, 5-12 cm. long, 1-2 cm. wide, ovate-lanceolate : panicle 

 5-10 cm. long, broadly ovoid, its branches spreading or ascending: spikelets 2.5-3 mm. 

 long and about 1 mm. wide, elliptic, obtuse *or acutish, pubescent. 



In dry places, New York to Tennessee, Missouri, Florida and Texas. Summer. 



112. Panicum mutabile Scribn. <fe Smith. Stems 4-8 dm. tall, tufted, glabrous, at 

 first erect, finally prostrate and much branched : leaves 3 or 4 ; sheaths glabrous, excepting 

 the ciliate margin ; blades glabrous, cordate and clasping at the base, ovate-lanceolate, the 

 basal ones larger than those on the stem and conspicuously ciliate with long hairs, the 

 stem-leaves with blades 6-12 cm. long and usually 1-2 cm. wide : panicle 1-1.5 dm. long, 

 broadly ovoid, its branches ascending : spikelets about 3 mm. long and 1-1.2 mm. wide, 

 pubescent. 



In sandy soil, Xorth Carolina to Florida and Mississippi. Summer and fall. 



113. Panicum Jodrii Vasey. Stems tufted, glabrous, at first erect, finally prostrate 

 and much branched : leaves 3 or 4 ; sheaths glabrous, excepting the ciliate margin ; blades 

 ovate-lanceolate, cordate and clasping at the base, glabrous, those on the stem, which are 

 smaller than the basal ones, 5-10 cm. long, 1-2 cm. wide : panicle 6-10 cm. long, ovoid, 

 its branches ascending : spikelets 2.5-3 mm. long and 1-1.2 mm. wide, obtuse or sometimes 

 acutish, pubescent. 



In sandy soil, Florida to Louisiana. Spring to fall. 



114. Panicum clandestinum L. Stems tufted, 6-14 dm. tall, glabrous, or some- 

 times papillose-hirsute below, finally much branched, the branches clothed with the densely 

 papillose-hispid overlapping leaf -sheaths : primary leaves usually 5-7, their sheaths shorter 

 than the internodes, ciliate on the exterior margin, at least the lower ones strongly papillose- 

 hispid with spreading hairs ; blades spreading or ascending, glabrous on both surfaces, 

 ciliate at the cordate and clasping base, the primary ones 1-2 dm. long, 1.5-2.5 cm. wide, 

 acuminate, lanceolate, those on the branches ovate-lanceolate and usually less than 1 dm. 

 long : primary panicle long-exserted, 9-12 cm. long, rarely larger, broadly ovate, its 

 branches ascending, the later panicles wholly or partially concealed in the sheaths : spike- 

 lets 2.7-3 mm. long and about 1.3 mm. wide, elliptic, pubescent with spreading hairs. 



In moist or wet places, Rhode Island and southern New York to Florida. Summer and fall. 



115. Panicum malacophyllum Nash. A perennial with the stems and sheaths 

 papillose-hirsute with long spreading hairs and the nodes barbed. Stems 3-4 cfm. tall, finally 

 somewhat branched above : leaves 4 or 5 ; sheaths about | as long as the internodes ; blades 

 ascending, lanceolate, softly pubescent on both surfaces, 5-7 cm. long, 5-7 mm. wide : 

 panicle 4-5 cm. long, its axis and spreading branches densely hirsute with spreading hairs : 

 spikelets 3 mm. long and about 1.5 mm. wide, broadly oval or obovoid, densely hirsute with 

 long spreading hairs. 



In dry soil, Tennessee and the Indian Territory. Spring. 



116. Panicum pernervosum Nash. A glabrous perennial. Stems 3-5 dm. tall, 

 finally branched : leaves 3 or 4 ; sheaths ciliate on the exterior margin ; blades erect or 

 ascending, narrowed toward the base, the larger ones 5-10 cm. long, 5-9 mm. wide, ciliate 

 toward the base with a few long hairs, the lower ones usually pubescent on the lower sur- 

 face, ciliate for f their length : panicle 7-12 cm. long, its branches ascending : spikelets 3 

 mm. long and 1.8 mm. wide, broadly oval, turgid, glabrous. 



In woods, eastern Texas. Spring. 



117. Panicum oltgosanthes Schult. Stems tufted, erect, 3-8 dm. tall, villous, 

 finally fasciculately branched : leaves 4 or 5 ; sheaths, at least the lower ones and those on 

 the branches, papillose-hispid, ciliate on the margin ; blades erect or ascending, 5-10 cm. 

 long, 5-10 mm. wide, lanceolate, softly and densely pubescent on the lower surface, the 

 upper surface glabrous, or with a few long hairs at the base : primary panicle 6-8 cm. long, 

 its branches ascending : spikelets about 3.5 mm. long and 1.7 mm. broad, oval, pubescent. 

 [P. pauciflorum Ell., not K. Br.] 



In dry soil, Virginia to Georgia and Mississippi. Summer and fall. 



118. Panicum Scribnerianum Nash. Stems tufted, erect, 1.5-6 dm. tall, simple, 

 finally dichotomously ^ branched above, sparingly pubescent or glabrous: leaf-sheaths 

 strongly papillose-hispid ; blades 5-10 cm. long, 6-12 mm. wide, spreading, glabrous : 



