200 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



panicles mostly narrow, sometimes loosely Bpikelike, sometimes rather open, attenuate 

 at summit, usually K) to 20 cm. long, rarely as much as io cm., the branches shorl and 

 crowded or ascending and 1 to 2 cm. long, approximate or, especially the lower, 1 to 3 cm. 

 distant, these rarely spreading or somewhat reflexed, the axis \ illouswith hairs as much 

 as 1 mm. long; bristles mostly one below each spikelet, flexuous, antrorsely scabrous, 

 mostly 5 to 10 mm. long, sometimes scarcely exceeding the spikelets; spikelets about 

 2 mm. long, rather strongly turgid on the convex side; first glume nearly half as long 

 as the spikelet, 3-nerved; second glume about two-thirds as long as the fertile lemma, 

 5-nerved; sterile lemma about as long as the fertile, 5-nerved. the palea well developed ; 

 fertile lemma acutish, finely but strongly cros°-ridged. 



In habit this species is rather variable, the differences being due chiefly to the 

 length of the bristles, the length and distance of the branches of the panicle, and the 

 relative amount of foliage. The usual form has rather densely flowered panicles with 

 short, ascending, approximate branches, and bristles 5 to 10 mm. long. An extreme 

 form (Panicum brachiatum Poir.), growing on dry brushy hillsides, has wiry, often 

 woody, sometimes decumbent and rooting stems, rather few and distant leaves, and 

 loose panicles with distant, spreading, sometimes reflexed branches as much as 5 cm. 

 long, and short bristles. However, there are all gradations to connect this with the 

 usual form. This open-panicled form is represented by: Jamaica, Hitchcock 93!"); 

 Porto Rico, Chase 6519, 6536, Britton, Cowell & Hess 1604, Britton & Wheeler 233. 



DISTRIBUTION. 



Dry woods and rocky hills at low altitudes, West Indies to Colombia. 



New Jersey: On ballast, Camden, Parker in 1879. 



Bahamas: Water Cay, Geogr. Soc. Baltimore 522. 



Cuba: Cayo Paloma, Shafer 2565. Nuevo Gerona, Palmer & Riley 1000. Guanta- 

 namo, Leon 3775, 3776; Britton 1930, 2105. Santiago de Cuba, Leon 829, 830, 

 831, 3946. 



Jamaica: Spanish Town Road, Harris 9297, 12477. Kingston, Hitchcock 9315, 971"): 

 Amer. Gr. Nat. Herb. 606; Alexander in 1855. Gordon Town, Hart 826, 829; Hitch- 

 cock 9325; Harris 11348, 11458. New Forest, Hitchcock 9846. Hope, Harris 

 11292. Long Mountain Road, Harris 11303, 11307. St. Andrew, Harris 11479. 

 Without locality, Mar\jh. 



Santo Domingo: Rincon, Fuertes 1378. Santiago, Eggers 2378. 



Porto Rico: Coamo, Sintenis 2987, 3197; Chase 6541. Cabo Rojo, Sintenis 853. 

 Santa Rita, Chase 6536; Johnston 1027. Guanica, Britton & Shafer 1901. 



Desecheo, Hess 424, 426^) Britton, Cowell & Hess 1604. Mona, Hess 447. Culebra, 



Britton & Wheeler 18, 233. Ensenada, Amer. Gr. Nat. Herb. mi; (Chase 6519T) 

 Boqueron, Chase 6505. cPonce, Chqse_648S^ 



Virgin Islands: St. Croix, Ricksecker 407. St. Thomas, Eggers in 1882. St. Jan, 

 Britton & Shafer 631. 



Leeward Islands: Guadeloupe, Duss 2698, 3188. Dominica, Jones 34. 



Trinidad: Chacachacare, Hitchcock 10059. 



Colombia: Santa Marta, Smith 154, 2188. 



23. Chaetochloa rariflora (Mikan) Hitchc. & Chase. 



Setaria rariflora Mikan; Trin. in Spreng. Neu. Entd. 2: 78. 1821. '"Hah. in 

 Brasilia." Trinius adds, ''(lch bin ungeweiss, ob dieses Gras nicht vielleicht das 

 Panicum caudatum. Lam. sey.)". The type, in the Trinius Herbarium, has a spike- 

 like few-flowered panicle. Trinius himself changed the name on the label to Pan icum 

 caudatum Lam. 



Setaria vaginata Spreng. Syst. Veg. 4: Cur. Post. 33. 1827. '"Rio grande Sello." 

 A duplicate type has been examined in the Vienna Herbarium. 



