22 



slender, antrorsely scabrous, 8 to 11 mm. long. Spikelets elliptical, acute, 2 mm. 

 long; first glume broadly ovate, acute or obtuse, 3 to 5-nerved, inclosing the 

 base of the spikelet; second gkune equaling the spikelet, short-apiculate, 5 to 

 9-nerved; third glume 5-nerved, slightly sulcate, subtending an ovate, hyaline 

 palea nearly its own length; flowering glumes elliptical-ovate, acute, short- 

 apiculate, nearly 2 mm. long, very smooth, glossy, not striate or rugose, the 

 inclosed palea equaling the glume, very smooth. 



Low groimds and marshes, often in shallow water, Delaware to Florida, Louisiana, 

 and western Texas, Bermuda, West Indies, Central America. 



Specimens examined. — Delaware: Collins Beach, 148 Commons 1892; Woodland 

 Beach, 148a Commons 1892; District of Columbia: Cultivated, Vasey 1889; Vir- 

 ginia: Smiths Island, Palmer 1897; Florida: Curtiss 1885; Merrits Island, Indian 

 Eiver, 3618 Curtiss 1879; Apopka, 21 Baker 1897; Fort Ogden, Lowe 1892; 

 Deland Co., Hill 1899; Grasmere, 1054 Combs & Baker, 1898; Barstow, 1219 

 Combs 1898; Homosassa, 464 Combs 1898; Eustis 1279 Nash 1894; Louisiana: 

 Pointe-a-la-Hache, 56 Langlois 1879; Texas: 801 Wright 1849; Bermuda: Munro 

 1864; Costa Rica: 6825 Pittier 1892. 



%X Flowering glume transversely undulate-rugose. 

 t Rachis very densely pilose. 



12. CH^TOCHLOA LONGIPILA (Fourn.) n. comb. Setaria longipila Fourn. 

 Mex. PI. Enum. Gram. 47 (1886) . 



An erect, somewhat ceespitose, glabrous annual, 3 to 5 dm. high, with slender cuLms, 

 short, lanceolate leaves and somewhat exserted, green, subspiciform panicles 2 to 

 7 cm. in length. Culms glabrous, except below the panicle, branching at the base; 

 nodes brown, bearded with appressed hairs; sheaths slightly compressed, striate, 

 glabrous, much shorter than the internodes, ciliate on the margms, slightly 

 bearded at the apex; ligule short, ciliate-fringed with long white hairs; leaf- 

 blades 5 to 10 cm. long, 5 to 10 mm. wide, tapering to the base and to the acute or 

 acuminate apex, scabrous on the upper side and on the cartilaginous margins, 

 nearly smooth beneath. Panicles about 6 mm. in diameter, interrupted, the 

 branches short, few-flowered; rachis densely pilose-pubescent, with long, erect, 

 white hairs extending a short distance below the panicle; set« 1 to 3, green, 

 stout, antrorsely scabrous, flexuous, 3 to 5 mm. long. Spikelets ovate-globose, 

 acute, about 1.7 mm. long; first glume about one-half as long as the spikelet, 

 triangular-ovate, acute, 3-nerved, slightly inclosing the base of the spikelet; second 

 glumeequalingthefloweringglume, strongly convex, 5-nerved; third glumeslightly 

 exceeding the flowering glume and somewhat inclosing it, 5-nerved, apiculate, 

 subtending a broadly-ovate, hyaline palea of nearly its own length; nerves in all 

 the glumes green, prominent; flowering glume strongly convex, broadly ovate, 

 acute, strongly transversely undulate-rugose, the inclosed palea striate, strongly 

 convex at the base, concave above, equaling the glume in length. 



Mexico. August. 



Specimens examined. — 2017 Rose 1897, foothills of the Sierra Madre Mountains, Ter- 

 ritorio de Tepic, between Agnacato and Dolores. 



This species has much the same habit as C. liebmannipauciflora,hut is at once dis- 

 guished from that and other related forms by its small, ovate, globose spikelets 

 and remarkably dense pilose-pubescent rachis. 



tt Rachis thinly pilose. 

 = Leaves scabrous. 



1:5. Chsetocliloa corrugata (Ell.) Scribn. U. S. Dept. Agr., Div. Agros. Bui. 4: 39 

 ^(1897) . Fauicum corrugatum Ell. Sk. Bot. S. Car. & Ga. 1 : 113 (1817) . Setaria 



