230 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



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



Bristles retrorsely barbed; plant annual 6. C. verticillata. 



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. imberbis. 



Inflorescence comparatively loose; involucral bristles 1 

 to 3. 



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



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 Baiios, 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 d- Shafer 244; Sagua, 

 Britton & 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 428. 



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



3. Chaetochloa onurus (Willd.) Scribn. & Merr. U. S. Dept. Agr. Div. Agrost. Bull. 



21: 27. 1900. 

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

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



WrighfMlA ; Wright 182: Wright 3887 in National Herbarium (3487 in Sauv. Fl. Cub.): 

 Triscornia, Tracy 9090; Cienfuegos, ( 'ombs 264 in Gray Herbarium. The following are 



a U. S. Dept. Agr. Div. Agrost. Bull. 21: 10. 1900. 



