39 



The specimen from New Jei-sey is depauperate, being but slightly over 1 dm. high 

 and densely cpespitose. 



28. Chaetocliloa setosa (Sw.) Scribn. U. S. Dept. Agr., Div. Agros. Bui. 4 : 37 

 (1897) . Panicum setosum Swartz, Prod. Veg. Ind. Occ. 22 (1788) . Setaria setosa 

 Beauv. Agrost. 51 (1812) . ChamserapMs setosa Kuntze Rev. Gen. PI. 2 : 769 (1891) . 

 (Fig. 24.) 



An erect branching perennial, 4 to 7 dm. high, with loose, slender, generally long- 

 attenuate panicles 1 to 2.5 dm. in length and linear-lanceolate, ]inT)esoent leaves 

 1 to 2 dm. long. Culms 

 rather slender, glabrous, 

 geniculate at the base, 

 cylindrical or subcom- 

 pressed, sometimes root- 

 ing at the lower nodes; 

 nodes glabrous; sheaths 

 generally equaling or longer 

 than the internodes, loose, 

 striate, nearly smooth at 

 the base, more or less pu- 

 bescent toward the apex, 

 ciliate on the margins ; ligule 

 very short, ciliate; leaf- 

 bl ad e s linear-lanceolate, 

 about 1 cm. broad, acumi- 

 nate, rounded at the base, 

 scabrous on the cartilagi- 

 nous margins. Panicle lax, 

 attenuate, 1 to 2 cm. in 

 diameter; axis angular, 

 pilose; branches slender, 

 few-flowered, 1 to 2.5 cm. 

 in length, equaling or ex- 

 ceeding the internodes; 

 setse 1 to 3 at each spike- 

 let, slender, flexuous, sca- 

 brous, 10 to 15 mm. long; 

 spikelets 2 mm. long, 

 elliptical-ovate, acute; first 

 glume about one-half the 

 length of the spikelet, acute 

 or acuminate, 3-nerved; 

 second glume nearly equal- 

 ing the spikelet, ovate, 

 acute, abruptly apiculate, 

 5-nerved; third glume 



equaling the fourth, 5-nerved, subtending a hyaline palea which nearly equals 

 the flowering glume in length; flowering glume about 2 mm. long, narrowly 

 ovate, acute or acuminate, finely transversely rugose, especially below. Palea 

 similar in markings and texture, equaling the glume in length. 



New Jersey, New Mexico, West Indies, Mexico, South America. 



Specimexs examined. — New Jersey: Camden, Parker 1879, on "ballast;" also collected 

 by Martindale, no date. Neio Mexico: Organ Mountains, 438 Wooton 1897. West 

 Indies: Kingston, Jamaica; Alexander 1853; March 1886, no locality; spikelets 

 from specimen in Kew Herbarium, cited by Grisebach Fl. Brit. W. Ind. 555; same 



Fig. 24. — Ohcetoehloa setosa: a, spikelet showing seta; 6,0, views 

 of the spikelet; d, lioweriug glume, dorsal view. 



