130 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
DESCRIPTION. 
Plants often widely spreading; culms ascending from a decumbent hbase, the ascend- 
ing portion 20 to 40 cm. high, rather slender, leafy, pubescent; sheaths short, but 
sometimes overlapping toward the summit and on the branches, ciliate and papillose- 
hirsute, at least toward the summit; ligules membranaceous-ciliate, scarcely 0.5 mm. 
long; blades spreading, thin, 2 to 6 cm. long, 1 to 2 cm. wide, 
ovate or ovate-lanceolate, somewhat unsymmetrical, acuminate, 
cordate and somewhat clasping at the ciliate base, glabrous or 
sparsely hirsute on both surfaces; panicles oval or ovate in out- 
line, 5 to 20 cm. long, nearly as wide, the axis sparsely pilose, 
the numerous branches and branchlets and the long pedicels 
Fie. 125.—P. trichoides. Capillary; spikelets 1.2 to 1.3 mm. long, about 0.5 mm. wide, 
From type specimen. obovate-elliptic, sparsely hirsute; first glume about half the 
length of the spikelet, acute, l-nerved; second glume shorter 
than the sterile lemma, both 3-nerved, and at maturity sometimes ruptured by the 
expanding fruit, often only the lower part of each remaining; fruit at maturity 1.3 
mm. long, 0.6 mm. wide, elliptic, minutely papillose while immature, becoming 
smooth but not polished. 
DISTRIBUTION. 
Woods and open ground, often a weed in cultivated soil, Mexico and the West 
Indies, south to Ecuador and Brazil. 
Mexico: Imala, Palmer 1758 in 1891; Manzanillo, Palmer 1083 in 1890; Acapulco, 
Palmer 287 in 1895; Guadalajara, Pringle 3828; Guatulco, Liebmann 317; 
Zacualpan, Purpus 2902; Cordoba, Finck in 1893; La Correa, Langlassé 380; 
Coahuayutla, Hmrick 53; Tabasco, Rovirosa 434; San Juan Bautista, Rovirosa 
598; Yucatan, Gawmer 522; Tres Marias Islands, Nelson 4257. 
GUATEMALA: Santo Thomas, Deam 6041; Dept. Santa Rosa, Heyde & Lux 4299; 
El Palmar, Kellerman 6263; Alta Vera Paz, Tuerckheim 7801. 
Honpuras: Wilson 188 (Field Mus. Herb.). 
Satvapor: San Salvador, Velasco in 1906. 
Costa Rica: Nicoya, Cooper 10379; Matina, Pittier 9754; Buenos Aires, Pittier 
3651, Tonduz 4865; San José, Tonduz 3123; without locality, Pittier 4458, 
16081. 
Cupa: Habana, Curtiss 714. 
JaMAIcA: Port Antonio, Fredholm 3282. 
Porto Rico: Mayaguez, Cowell 522, 583, Sintenis 160; Ponce, Heller 6094; 
Luquillo Mountains, Wilson 283; Martin Pefia, Heller & Heller 387; Cayey, 
Heller & Heller 531; Mount Morales, Britton & Cowell 444; Rio Piedras, 
Barrett 61; Santurce, Heller & Heller 157. 
LEEWARD IsLANDs: St. Christopher, Britton & Cowell 295; Dominica, Eggers 
in 1881; Guadeloupe, Duss 2681. 
WINDWARD Istanps: Martinique, Duss 1321, Hahn 1047; Granada, Brocdaaye in 
1905, Eggers 5987. 
Cotompsia: State of Magdelena, Pittier 1621; Cali, Pittver 971; Santa Marta, 
Smuth 167. 
VENEZUELA: Tovar, Fendler 2499. 
TriniwaD: ‘Ex herb. W. Mitten,’ collector not given. 
British Guiana: Demerara, Jenman 4403. 
Braziu: Para, Spruce 466 (Panicum 13); without locality, Burchell 8706. .« 
Ecuapor: Balao, Eggers 14481; El Recreo, Eggers 15417. 
