504 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
collection) in the Berlin Herbarium are in the National Herbarium. A restudy of 
these together with later collections show that they are referable to P. parviglume. 
Fournier’s description is vague and inadequate and appears to have been based on | 
more than one species, the vegetative characters as described being unlike those of 
any species in this group. Because of this uncertainty the name P. conchatum is not 
taken up to replace P. parviglume. 
Panicum arundinariae Trin.; Fourn. Mex. Pl. 2: 25.1886. This name is also included 
among the doubtful species.’ Miiller’s no. 2018, one of the specimens cited by 
Fournier, is P. parviglume, while another, Schaffner 279, also cited, is Panicum vir- 
gultorum. As in the preceding case, the description is inadequate, for which reason 
the name P. arundinariae is not taken up. 
DISTRIBUTION. 
Banks and ditches, southern Mexico 
to Costa Rica. The type specimen 
from San José, Costa Rica. 
Veracruz: Orizaba, Bourgeau 
3197, Miller 2018. Borrego, 
Botteri 150, 152. 
Costa Rica: Alajuelita, Jiménez 
Fic. 89.—Distribution of P. parviglume. 403. San Francisco de 
Guadalupe, Tonduz & Pittier 8448, Jiménez 113. San José, Hitchcock 
8487. 
TRICHOIDIA. 
One of the two species of this group, Panicum trichanthum, is found to be a perennial. 
Blades more than one-fourth as wide as long; spikelets pubes- 
cent: plants annual: . <-o 2. so scan isos aes ees 67. P. trichoides. 
Blades less than one-eighth as wide as long; spikelets minutely 
bullate-rugose; plants perennial...............-.------- 68. P. trichanthum. 
67. Panicum trichoides Swartz. 
Panicum trichoides Swartz, Prodr. Veg. Ind. Occ. 24. 1788; Contr. U. 8. Nat. Herb. 
15: 129. 1910. 
DISTRIBUTION. 
Damp shady places, often a weed in fields and groves, tropical America. The type 
specimen from Jamaica. 
SrnaLoa: Imala, Palmer 1758 in 1891. 
Terric: Maria Madre Islands, Nelson 4257. 
JALisco: Guadalajara, Amer. Gr. Nat. Herb. 70, Pringle 2618, 3828. 
Couma: Manzanillo, Palmer 1083 in 1890. Colima, Oreuté 4515. Alzada, Hitch- 
cock 7110. 
MicHoacdn: La Correa, Langlassé 380. Hacienda Coahuayula, Emrick 53. 
Veracruz: Zacuapan, Purpus 2902. Minatitlan, Smith 601. Cdérdoba, Finck in 
1893. Sanborn, Orcutt 3241. 
GuERRERO: Acapulco, Palmer 287 in 1894. 
Oaxaca: Guatulco, Liebmann 317. 
Tasasco: Mayito, Rovirosa 434. San Juan Bautista, Rovirosa 598. 
YucatAn: Izamal, Gaumer 522. San Anselmo, Gaumer 895, 2027. 
1 Contr. U. S. Nat. Herb. 15: 329. 1910. 
