Part 3, 1915] POACEAE 247 



102. Panicum strigosum Muhl. ; Ell. Bot. S. C. & Ga. 1 : 126. 1816. 



Panicum laxiflorum pubescens Vasey, Contr. U. S. Nat. Herb. 3: 30. 1892. 

 Panicum longipedunculatum Scribn. Bull. Tenn. Exp. Sta. 7: 53. 1894. 



Vernal phase similar to that of P. ciliatum, but having sparsely pilose culms and leaf- 

 sheaths, bearded nodes, and blades on the average a little wider and more or less pilose on both 

 surfaces; panicles larger, with pilose axis and branches, bearing more numerous, smaller, gla- 

 brous spikelets, the latter 1.3-1.5 mm. long, 0.7 mm. wide, obovate, less turgid than in other 

 species of this group; first glume one third to half the length of the spikelet; second glume and 

 sterile lemma equal, faintly nerved; fruit 1.3 mm. long, 0.6-0.7 mm. wide, elliptic, subacute, 

 not umbonate. 



Autumnal phase a dense mat, with panicles scarcely rising above the leaves. 



Type locality : South Carolina. 



Distribution: Virginia and Tennessee to Florida and eastern Texas, and south to Colombia; 

 Cuba, Santo Domingo, and Jamaica. 



Illustrations: Bull. Tenn. Exp. Sta. 7: pi. 16, f. 61; Bull. U. S. Dep. Agr. Agrost. 7: /. 62: 

 Contr. U. S. Nat. Herb. 15: /. 154; Britt. & Brown, 111. Fl. ed. 2. /. 335. 



103. Panicum aciculare Desv.; Poir. in Lam. Encyc. Suppl. 4: 274. 



1816. 



Panicum setaceum Muhl. Descr. Gram. 99. 1817. 



Panicum subuniflorum Bosc; Spreng. Syst. 1: 312. 1825. 



Panicum arenicola Ashe, Jour. EUsha Mitchell Soc. 15: 56. 1898. 



Panicum filirameum Ashe, Jour. Elisha Mitchell Soc. 16: 88. 1900. 



Panicum pungens Muhl.; Scribn. & Merr. Circ. U. S. Dep. Agr. Agrost. 27: 2, as synonym. 1900. 



Vernal culms numerous in a tuft, ascending from a spreading base, appressed-pubescent 

 below, glabrate above, 20-50 cm. or, in shaded situations, 60 cm. or more high, the nodes more 

 or less pubescent but not bearded; lower leaf -sheaths villous, the upper glabrous except the 

 ciliate margin; blades stiff, spreading or ascending, narrowed to an involute point, glabrous 

 or the lower sparsely pilose, somewhat papillose-hispid on the margin at base, the middle culm- 

 blades 4-6 cm. long, rarely longer, 2-5 mm. wide, the uppermost shorter, usually only 1-2 cm. 

 long and 1-2 mm. wide; panicles open, 3-7 cm. long, the flexuous branches spreading at 

 maturity; spikelets 1.9-2 mm. long, 1.1 mm. wide, obovate, blunt, the basal attenuation short; 

 first glume about one fourth the length of the spikelet, obtuse or pointed ; second glume and 

 sterile lemma equal, papillose-pubescent; fruit 1.6 mm. long. 1 mm. wide, oval-elliptic, glabrous 

 at the apex. 



Autumnal phase consisting of numerous bushy-branched culms 1CK50 cm. long, spreading 

 and forming dense cushions, the short blades involute, sharp-pointed and usually arcuate, 

 mostly 1—3 cm. long; spikelets more turgid than in the vernal form. 



TypB locality: Probably Porto Rico, though the published locality is "Indes orientales." 

 Distribution: New Jersey to Florida and eastern Texas; Cuba and Porto Rico. 

 Illustrations: Bull. U. S. Dep. Agr. Agrost. 4: /. 9; Contr. U. S. Nat. Herb. 15: /. 156; 

 Britt. & Brown, 111. Fl. ed. 2. /. 338. 



104. Panicum chrysopsidifolium Nash, in Small, Fl. SE. U. S. 100. 1903. 



Vernal phase with ascending or spreading, rather slender culms, 30-45 cm. high, purplish, 

 grayish-villous, especially below, the nodes bearded; leaf-sheaths much shorter than the in- 

 ternodes, villous like the culm, densely so at the summit; blades 5-10 cm. long, 3-5 mm. wide, 

 tapering from base to apex, conspicuously pointed, villous on both surfaces; panicles finally 

 long-exserted, 4r~6 cm. long, about three fourths as wide, the flexuous branches ascending or 

 spreading; spikelets 2 mm. long, 1.2-1.3 mm. wide, obovate, blunt and turgid; first glume one 

 third the length of the spikelet, subacute or obtuse; second glume and sterile lemma subequal, 

 scarcely covering the fruit at maturity, villous, the bullate papillae prominent; fruit 1.7 mm. 

 long, 1.2 mm. wide, broadly elliptic, minutely puberulent at the apex. 



Autumnal phase spreading and forming mats, the culms slender, often zigzag toward the 



tip; blades numerous, flat, becoming papery with age, mostly 1-3 cm. long, 1.5 mm. wide; 



spikelets more turgid than usual in the primary panicle. 



Typb locality: L/eon County, Florida. 



Distribution: Florida to Louisiana and the Greater Antilles. 



Illustration: Contr. U. S. Nat. Herb. 15: /. 158. 



