HITCHCOCK AND CHASE NOKTH AMERICAN PANICUM. 113 



sometimes glabrous; spikelets 1.4 to 1.5 mm. long, 0.5 mm. wide, not thickened, 

 pointed; first glume about half the length of the spikelet, 3-nerved, acute; second 

 glume and sterile lemma equal, 3 to 5-nerved, exceeding the fruit, the sterile palea 

 only about half the length of its lemma; fruit 1 mm. long, 0.5 mm. wide, obovate. 



This species differs from P. laxum and P. pilosum in the pointed spikelets which 

 are not expanded by an enlarged sterile palea, and in the compound lower branches - 

 of the panicle. 



DISTRIBUTION. 



Swamps and moist soil along roads and in open woods, Mexico to Brazil and Paraguay. 

 Mexico: Cordoba, Bourgeau 1662 in part. 

 Guatemala: Dept. Alta Vera Paz, Collins & Goll 08, Cook & Griggs 530, Tuerck- 



heim 7797, 8795; Puerto Barrios, Kellerman 5114. 

 Honduras: San Pedro Sula, Thieme 781, 5578, 5587 in part. 

 Costa Rica: Buenos Aires, Tonduz 4042; Turrialba, Tonduz 4092; Tuis, Tonduz 

 11396; Talamanca, Tonduz 8557; Carrillo, Biolleij 3107; Echevema, Pittier & 

 Tonduz 2479; San Jose, Pittier 1183. 

 Panama: Hart 73. 



Colombia: Santa Marta, Smith 206, 2190. 

 Trinidad: Fendler 946 (Kew Herb.). 

 Brazil: Madeira, Rusby 199 in part. 

 Paraguay: Morong 441. 



59. Panicum pilosum Swartz. 



Panicum pilosum Swartz, Prodr. Veg. Ind. Occ. 22. 1788. " Jamaica." The type, 

 in the Swartz Herbarium, labeled "Jamaica, Swartz. P. pilosum fl. ind. occ," consists 

 of two branching plants. 



Panicum distichum Lam. Encycl. 4 : 731. 1798. " Cette plante croit a la Jamaique." 

 The type, in the Lamarck Herbarium, consists of a panicle only. No locality is given 

 upon the label. 



Panicum pilisparsum Meyer, Prim. Fl. Esseq. 57. 1818. "In graminosis humidis 

 plantitionis Hamburg," Essequibo [British Guiana]. The type is in the Gottingen 

 Herbarium, but a portion of this is in the Trinius Herbarium and was examined there. 



Panicum trichophorum Schrad. in Schult. Mant. 2: 247. 1824. " In Brasilia. Princeps 

 Sereniss. Maximil. Neowidensis." The type is in the Schrader Herbarium at the 

 Botanical Garden in St. Petersburg. 



Setaria disticha Humb.; Spreng. Syst. Veg. 1:305. 1825. Based on "Panicum 

 distichon Lam." 



Panicum distans Willd.; Spreng. Syst. Veg. 1: 305. 1825. This herbarium name 

 of Willdenow is given as a synonym under Setaria disticha Humb. The type, in 

 the Willdenow Herbarium, was collected by Humboldt in "America meridionale." 



Panicum densiflorum Willd. ; Spreng. Syst. Veg. 1: 320. 1825. The name is credited 

 to "W. herb.," and the locality is given as " Ad Orinoc." The type collected by 

 Humboldt, in the Willdenow Herbarium, is labeled "Amer. Merid." 



Setaria pilosa Kunth, Rev. Gram. 1: 47. 1829. Based on Panicum pilosum Swartz. 



Setaria meyeri Kunth, Rev. Gram. 1: 47. 1829. Based on Panicum pilisparsum 

 Meyer. 



Setaria schraderi Kunth, Rev. Gram. 1: 47. 1829. Based on Panicum trichophorum 

 Schrad. 



Panicum apiculatum Salzm.; Steud. Syn. PI. Glum. 1: 65. 1854. This is given 

 as a synonym under P. pilosum Swartz. In the Trinius Herbarium and in the United 

 States National Herbarium are specimens bearing this name collected by Salzmann in 

 Bahia, Brazil, which belong to P. pilosum. 



41616°— vol 15—10 8 



