Part 3, 1915] POACEAE 213 



not turgid, subacute; first glume about one fifth the length of the spikelet, nerveless, erose- 

 truncate; second glume half to two thirds the length of the spikelet, faintly 3-nerved; sterile 

 lemma as long as the fruit, very faintly nerved toward the summit, inclosing a palea of equal 

 length and a staminate flower; fruit 2.8-3 mm. long, 1.2-1.3 mm. wide, narrowly ovate, acute, 

 very obscurely rugose, the margins scarcely inrolled. 



Type locality : Eustis, Florida. 



Distribution : Florida, Texas, Mexico, and Central America ; also in Uruguay. 



tx J^ustrations : Bull. U. S. Dept. Agr. Agrost. 7: /. 41 (as P. paspalodes) ; Contr. U. S. Nat. 

 Herb. 15: /. 13. 



9. Panicum barbinode Trin. M£m. Acad. St.-Petersb. VI. 3 2 : 256. 



1834. 



? Panicum muticum Forsk. Fl. Aegypt.-Arab. 20. 1775. 



Panicum purpurascens Raddi, Agrost. Bras. 47. 1823. Not P. purpurascens H. B, K. 1815. 



Panicum guadaloupense Steud. Syn. Gram. 61. 1854. 



Panicum equinum Salzm.; Steud. Syn. Gram. 67. 1854. 



Panicum pictiglume Steud. Syn. Gram. 73. 1854. 



Panicum paraguayense Steud.; Doell, in Mart. Fl. Bras. 2 2 : 189, as synonym. 1877. 



Plants perennial, sending out widely' creeping stolons; culms decumbent at base, rooting 

 at the lower nodes, the flowering shoots upright, 1-3 m. high, robust, simple, or producing leafy 

 shoots only, glabrous, the nodes densely villous ; leaf-sheaths softly or harshly villous to merely 

 papillose or even glabrous toward the summit, densely pubescent at the juncture with the 

 blades; ligule membranaceous, densely ciliate, about 1 mm. long; blades ascending or spreading, 

 10-30 cm. long, 10-15 mm. wide, rounded at the base, glabrous on both surfaces, the margin 

 scabrous; panicles 12-20 cm. long, about half as wide, the rather distant, subracemose, densely 

 flowered branches ascending or spreading, the main axis and the somewhat flattened branches 

 scabrous on the edges, densely pubescent in the axils, a few stiff hairs on the very short pedicels; 

 spikelets 3 mm. long, 1.3 mm. wide, elliptic ; first glume about one fourth the length of the spike- 

 let, 1 -nerved, acute; second glume and sterile lemma subequal, both exceeded by the sterile 

 palea; fruit about 2.5 mm. long, 1.1 mm. wide, obtuse, minutely transversely rugose. 



Type locality: Bahia, Brazil. 



Distribution: Florida, Texas, and tropical America;- also in the warmer parts of the Old 

 World. 



Illustrations: Trin. Ic. pi. 318: Vasey, Agr. Grasses U. S. pi. 6; ed. 2. pi. 12; Contr. U. S. 

 Nat. Herb. 15: /. 15. 



This species has been erroneously referred to Panicum molle Sw. (see page 214). 



10. Panicum reptans L. Syst. Nat. ed. 10. 870. 1759. 



Panicum grossarium I,. Syst. Nat. ed. 10. 871. 1759. 



Panicum prostratum Lam. Tab. Bncyc. 1: 171. 1791. 



Panicum caespitosum Sw. Fl. Ind. Occ. 146. 1797. 



Panicum insularum Steud. Syn. Gram. 61. 1854. 



Brachiaria prostrata Griseb. Abh. Ges. Wiss. Gott. 7: 263. 1857. 



Panicum aurelianum Hale; Wood, Class Book ed. 1861. 787. 1861. 



Panicum prostratum pilosum Eggers, Fl. St. Croix 104. 1879. 



Plants spreading, usually prostrate, or with a decumbent base, rooting at the lower nodes ; 

 culms slender, usually freely branching, ascending 10-30 cm. above the decumbent or creeping 

 base, glabrous, the nodes usually puberulent; leaf-sheaths loose, glabrous, densely ciliate, 

 shorter than the internodes; ligule a dense ring of hairs 1 mm. long or less; blades lanceolate 

 or ovate-lanceolate, 1.5-6 cm. long, 4-12 mm. wide, cordate, glabrous or puberulent on both 

 surfaces, the white, undulate margin hispid-scabrous, ciliate at base with long, stiff hairs; 

 inflorescence finally long-exserted, 2-6 cm. long, consisting of 3-12 spike-like, ascending or 

 spreading racemes arranged along a main axis; racemes solitary or sometimes somewhat fas- 

 cicled, the upper approximate and shorter, the lower rather distant and 2—3 cm. long; rachises 

 and pedicels scabrous and usually sparsely pilose with long, weak hairs; spikelets borne on one 

 side of the rachis, irregularly and rather densely clustered, on pubescent pedicels 1 mm. or less 

 in length, elliptic, 1.9-2 mm. long, 0.9-1 mm. wide, acute, glabrous; first glume about one sixth 

 the length of the spikelet, rounded or truncate ; second glume and sterile lemma slightly ex- 

 ceeding the fruit, strongly 5- to 7-nerved; fruit 1.7 mm. long, 0.8 mm. wide, elliptic, apiculate. 



