214 NORTH AMERICAN FLORA [Volume 17 



As a whole this species is very uniform, but the long hairs on the secondary rachises and 

 pedicels are sometimes wanting. 



Type locality: Jamaica. 



Distribution: Florida to Texas, the Atlantic slope of Mexico, and the West Indies; also in 

 northern South America and the warm regions of the Eastern Hemisphere. 



Iixustr ations : Trin. Ic. pi. 184; pi. 185, f. A ; Bull. U. S. Dep. Agr. Agrost. 17: /. 341; Contr. 

 U. S. Nat. Herb. 15: /. 17. 



11. Panicum fasciculatum Sw. Prodr. 22, 1788. 



Panicum chartaginense Sw. Prodr. 22. 1788. 



Panicum fuscum Sw. Prodr. 23. 1788. 



Panicum jiavescens Sw. Prodr. 23. 1788. 



Panicum f us co-rubens Lam. Tab. Encyc. 1: 171. 1791. 



Panicum fastigiatum Poir. in Lam. Encyc. Suppl. 4: 277. 1816. 



Panicum nigricans Willd.; Spreng. Syst. 1: 310, as synonym. 1825. 



Panicum f us catum Presl; Nees, Agrost. Bras. 152, as synonym. 1829. 



Panicum spithamaeum Willd.; Nees, Agrost. Bras. 152. 1829. 



Panicum illinoniense Desv. Opusc. 91. 1831. 



Panicum reticulatum Griseb. Abh. Ges. Wiss. Gott. 7: 264. 1857. Not P. reticulatum Torr. 1853. 



Panicum fuscum fasciculatum Griseb. Fl. Brit. W. Ind. 547. 1864. 



Panicum fasciculatum genuinum Doell, in Mart. Fl. Bras. 2 2 : 204. 1877. 



Panicum fasciculatum Jiavescens Doell, in Mart. Fl. Bras, 2 2 : 205. 1877. 



Panicum fasciculatum fuscum Doell, in Mart. Fl. Bras. 2 2 : 205. 1877. 



Panicum fasciculatum chartaginense Doell, in Mart. Fl. Bras. 2 2 : 205. 1877. 



Plants erect or spreading from a decumbent bage, the more robust becoming much 

 branched from the lower nodes; culms 30-100 cm. high or more, glabrous or scabrous, or some- 

 times pubescent below the panicle or hispid below the appressed-pubescent nodes; leaf -sheaths 



I 



sometimes shorter, sometimes longer than the internodes, glabrous or more or less papillose- 

 hispid, densely ciliate, pubescent at the juncture with the blades; ligule a dense ring of hairs 

 about 1 mm. long; blades flat, 4r-30 cm. long, 6-20 mm. wide, glabrous, usually scabrous above, 

 sometimes sparsely hispid on one or both surfaces, the nerves in the larger blades conspicuous, 

 sometimes appearing somewhat plicate; inflorescence short-exserted or included atbase untilma- 

 turity, consisting of a series of spike-like racemes arranged along a scabrous, sometimes pilose, 

 main axis, 5-15 cm. long, the racemes 5-10 cm. long, solitary or fascicled, narrowly ascending 

 or somewhat spreading, spikelet-bearing from the base, or naked below, the short-pediceled 

 spikelets approximate or somewhat crowded, borne singly, or two or three together on short 

 branchlets, along the underside of the axis; spikelets bronze to mahogany-colored, 2.1-2.5 

 mm. long, in occasional specimens as much as 3 mm. long, obovate, turgid, abruptly short- 

 pointed, glabrous; first glume clasping, about one third the length of the spikelet, subacute, 

 5-7-nerved; second glume and sterile lemma slightly exceeding the fruit, 9-nerved, faintly to 

 strongly transversely wrinkled between the nerves; fruit 1.9-2.3 mm, long, obovate, obscurely 

 apiculate. 



Type locality: Jamaica. 



Distribution : Southern Florida and Texas, and southward through Mexico and the West Indies 

 to tropical South America. 



Illustrations: Trin. Ic. pi. 206; Field Columb. Mus. Publ. Bot. 3: 34 (both as P. fuscum); 

 Contr. U. S. Nat. Herb. 15: /. 19; f. 21 (as P. fasciculatum chartaginense). 



Panicum fasciculatum reticulatum Beal, Grasses N. Am. 2: 117. 1896. Panicum reticulatum 

 Torr. in Marcy, Kxpl. 299. 1853. Panicum fuscum reticulatum Scribn. & Merr.; Merrill, Circ. 

 U. S. Dep. Agr. Agrost. 32: 4. 1901. Differing in the smaller, more compact panicles, with as- 

 cending or appressed branches, the narrower blades, usually pubescent on both surfaces, and the 

 spikelets 2.6-3 mm. long. Texas to Arizona, and south to southern Mexico. Originally described 

 from the main fork of Red River [Texas]. 



12. Panicum molle Sw. Prodr. 22. 1788. 



Plants ascending or spreading from a decumbent base, usually branching; culms 30-70 

 cm. high, softly pubescent, at least below the pubescent nodes; leaf-sheaths usually shorter 

 than the internodes, loose, softly pubescent between the nerves, sometimes obscurely so, dense- 

 ly ciliate; ligule a dense ring of hairs about 1 mm. long; blades ascending or spreading, 4-15 cm. 

 long, rarely longer, 7-15 mm. wide, rounded at the base, finely and softly pubescent on both 

 surfaces or nearly glabrous on the upper; panicles short-exserted or, especially those of the 

 branches, included at base, 6-15 cm. long, the several to many subracemose branches ascending, 

 rarely widely spreading at maturity, the main axis and those of the branches densely and softly 



