230 CONTRIBUTIONS PROM THE NATIONAL HERBARIUM. 



36. CHAETOCHLOA Scribn. U. S. Dept. Agr. Div. Agrost. Bull. 4: 38. 1897. 



Bristles retrorsely barbed; plant annual 6. C vertidllata. 



Bristles antrorsely barbed; plants perennial. 



Culms pilose 1. C. hispida. 



Culms glabrous. 



Inflorescence dense and spike-like; inVolucral bristles 5 

 or more. 

 Bristles scarcely exceeding the spikelets; racemes 



slender 4. C. purpurascens. 



Bristles 2 to 4 times as long as spikelets; racemes 



thick 2. C. imberhis. 



Inflorescence comparatively loose; involucral bristles 1 

 to 3. 



First glume 5-nerved, second 9 to 11-nerved 3. C. onurus. 



First glume 3-nerved, second 5-nerved 5. C. setosa. 



1. Chaetochloa hispida Scribn. & Merr. U. S. Dept. Agr. Div. Agrost. Bull. 21: 25. 



1900. 

 Sandy pine woods, La Grija, Nueva Filipina, January, Wright in 1865, in the Gray 

 Herbarium. 



2. Chaetochloa imberbis (Poir.) Scribn. U, S. Dept. Agr. Div. Agrost. Bull. 4: 39. 



1897. 



Panicum imberbe Poir. Encycl. Suppl. 4: 272. 1817. 



Savannas, Chirigote, June 13, Wright 3472, 3473; Santiago de las Vegas, Baker HC 

 518, 561, 636, 1358, Hitchcock in 1906; Habana, Curtiss 749, Leon 269, Tracy 9112; 

 San Diego de los Banos, Palmer <& Riley 546; Herradura, Baker HC 2965, Hitchcock in 

 1906; Isle of Pines, Taylor 45. The following are in the herbarium of the New York 

 Botanical Garden: Matanzas, Britton & Wilson 170, Britton & Shafer 244; Sagua, 

 Britton <fe Wilson 319; Madruga, Shafer 454. 



The species of Chaetochloa here considered are accepted as defined by Scribner and 

 Merrill. «^ I have not seen the type of Panicum imberbe Poir. nor of Panicum genicu- 

 latum Lam., which may be an older name for the same. 



In the Grisebach Herbarium are the following Wright specimens : 1 . " Wet ground 

 around lagunas, Hanabana, May 16," no. 199 of 1865, a prostrate bunch with culms 

 15 to 20 cm. long. The bristles are only a little longer than the spikelets, the spikes 

 about 1 cm. long, the blades without the scattered long hairs on the upper -surface 

 found in most of the specimens. 2. No. 200 of 1865, which Grisebach has labeled 

 Setaria glauca a. This also has short bristles. 3. No. 3472, 1860-64, bristles short. 

 4. No. 3473, 1860-64, bristles about 5 mm. long. 



2a. Chaetochloa imberbis penicillata (Nees) Scribn. & Merr. U. S. Dept. Agr. Div. 

 Agrost. Bull. 21: 11. 1900. 



Panicum penicillatum Nees, Agrost. Bras. 242. 1829. 



Matanzas, July 7, Wright 3888; Santiago de las Vegas, Baker 522, 1276; Guines, 

 Leon 42S. 

 This differs from C. imberbis chiefly in having longer bristles. 



3. Chaetochloa onurus (^\^itid.) Scribn. & Merr. U. S. Dept. Agr. Div. Agrost. BuU. 



21: 27. 1900. 

 Panicum onurus Willd.; Nees, Agrost. Bras. 251. 1829, as synonym. 

 Setaria onurus Griseb. Fl. Brit. W. Ind. 555. 1864. 



Wright U7 4; Wright 1S2; Wright 3887 in National Herbarium (3487 inSauv. Fl. Cub.); 

 Triscornia, Tracy 9090; Cienfuegos, Combs 264 in Gray Herbarium. The following are 



a U. S. Dept. Agr. D»v. Agrost. Bull. 21: 10. 1900. 



