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. PI. 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 Jose, Costa Rica. 



Veracruz: Orizaba, Bourgeau 

 3197, Mailer 2018. Borrego, 

 Botteri 150, 152. 



Costa Rica: Alajuelita, Jimenez 



403. San Francisco de 



Jimenez 113. San Jose, Hitchcock 



Fig. 89. — Distribution of P. parviglume. 



Guadalupe, Tonduz & Pittier 8448, 



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 67. P. trichoides. 



Blades less than one-eighth as wide as long; sj^ikelets minutely 



buUate-rugose ; plants perennial 68. P. trichanthum. 



67. Panicura trichoides Swartz. 



Panicum trichoides Swartz, Prodr. Veg. Ind. Occ. 24. 1788; Contr. U. S. Nat. Herb. 

 15: 129. 1910. 



DISTRIBUTION. 



Damp shady places, often a weed in fields and groves, tropical America. The type 

 specimen fi'om Jamaica. 



Sinaloa: Imala, Palmer 1758 in 1891. 



Tepic: Maria Madre Islands, Nelson 4257. 



Jalisco: Guadalajara, Amer. Gr. Nat. Herb. 70, Pringle 2618, 3828. 



Colima: Manzanillo, Palmer 1083 in 1890. Colima, Orcutt 4515. Alzada, Hitch- 

 cock 7110. 



MichoacXn: La Con-ea, Langlasse 380. Hacienda Coahuajaila, Emrick 53. 



Veracruz: Zacuapan, Purpus 2902. Minatitlan, Sinith 601. Cordoba, Finch in 

 1893. Sanborn, Ormrt 3241. 



Guerrero: Acapulco, Palmer 287 in 1894. 



Oaxaca: Guatulco, Liebmann 317. 



Tabasco: Mayito, Rovirosa 434. San Juan Bautista, Rovirosa 598. 



YucatAn: Izamal, Gaumer 522. San Anselmo, Gaumer 895, 2027. 



^ Contr. IJ. S. Nat. Herb. 15: 329. 1910. 



