HITCHCOCK AND CHASE—-NORTH AMERICAN PANICUM. aS 
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. lacum and P. piloswm 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 Braziland Paraguay. 
Mexico: Cérdoba, Bourgeau 1662 in part. 
GuaTEemMaLa: Dept. Alta Vera Paz, Collins & Goll 08, Cook & Griggs 530, Tuerck- 
heim 7797, 8795; Puerto Barrios, Kellerman 5114. 
Honpuras: San Pedro Sul4, Thieme 781, 5578, 5587 in part. 
Costa Rica: Buenos Aires, Tonduz 4042; Turrialba, Tonduz 4092; Tuis, Tonduz 
11396; Talamanca, Tonduz 8557; CarrilJ6, Brolley 3107; Echeverria, Pittier & 
Tonduz 2479; San José, Pitter 1183. 
Panama: Hart 73. 
Cotomspia: Santa Marta, Smith 206, 2190. 
Trinipapb: Hendler 946 (Kew Herb.). 
Brazit: Madeira, Rusby 199 in part. 
Paracuay: Morong 441. 
vo 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 créit & 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 isin the Géttingen 
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. y) gp’ Jean. Quae Sp. fippz. ("1G. 5 
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, Rév. Gram. 1: 47.1829. Based on Panicum pilosum Swartz. 
Setaria meyeri Kunth, Rév. Gram. 1: 47. 1829. Based on Panicum pilisparsum 
Meyer. 
Setaria schradert Kunth, Rév. Gram. 1: 47. 1829. Based on Panicum trichophorum 
Schrad. 
Panicum apiculatum Salzm.; Steud. Syn. Pl. Glum. 1: 65. 1854. This is given 
asasynonym 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°—vo1t 15—10——8 
