30 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
Geminata.—Perennials; culms tall, spreading or creeping; inflorescence consisting 
of several erect, spike-like racemes distributed along an elongated axis; 
spikelets secund, glabrous, fruit more or less transversely rugose or roughened. 
Growing in water or wet places. 
Nodes bearded............2 20022-00222 22222 e eee ee cee eee eee 9. P. barbinode. 
Nodes glabrous. 
Spikelets 3 mm. long; glumes and sterile lemma papery..... 8. P. paludivagum. 
Spikelets not over 2.4mm. long; glumes and sterile lemma 
not papery.....--2.- 2-2-2222 6 eee eee eee eee eee eee 7. P. geminatum. 
7. Panicum geminatum Forsk. 
Panicum geminatum Forsk. Fl. Aegypt. Arab. 18. 1775. ‘‘Rosettae in pratis ad 
littora Nili.”” We have not seen the type of this, but the description applies to the 
American plant which appears to be the same as the Old World species. We are 
informed by Mr. A. B. Rendle that the type is not in the herbarium of the British 
Museum. 
Paspalum appressum Lam. Tabl. Encycl. 1: 176. 1791. ‘“‘Ex America merid. 
Com. D. Richard,’’ We have not seen the type specimen. 
Digitaria appressa Pers. Syn. 1: 85. 1805. Based on Paspalum appressum Lam. 
? Digitaria affinis Roem. & Schult. Syst. Veg. 2: 470.1817. ‘In Santa Fé de 
Bogota. Ab amiciss. Zea nobiscum communicata.’’ This specimen has not been 
examined, but the form to which Nees@ and Trinius refer Roemer and Schultes’s 
name, as shown by a specimen from Bahia in the Trinius Herbarium sent by Nees, is 
the one here described. Roemer and Schultes’s description leaves the species in 
doubt, however, since it would only apply to an unusually small specimen and may 
possibly refer to a different species from that to which Nees and Trinius applied the 
name. 
Panicum beckmanniaeforme Mikan; Trin. in Spreng. Neu. Entd. 2:83. 1821. ‘‘ Hab. 
in Brasilia.’ A portion of the type is in the Trinius Herbarium. It is from Brazil 
sent by Mikan. 
Panicum truncatum Trin. Gram. Pan. 130. 1826. The author states he has seen 
specimens from ‘Ind. or., Egypt (LINDLEY. Strser in hb. Maur. I. I. no. 28.) e 
Brasil.—s. nom. Panic. affine Schult.—N. aB Esens.”’ The specimen figured in the 
Icones® is from Egypt. The specimen has not been examined, but the plate shows 
the species to be the same as the above-mentioned specimen sent by Nees under the 
name of P. affine Schult. 
? Panicum affine Nees, Agrost. Bras. 113. 1829. Among several other names 
“Digitaria affinis R. & Sch.’ is cited as a synonym. Since this specific name is 
retained, this is considered as based on Digitaria affinis Roem. & Schult., though 
Nees’s description is evidently based on the specimen first cited, one collected by 
Martius in Bahia, Brazil, and preserved in the Munich Herbarium, and belonging to 
the species here described. 
Panicum brizaeforme Presl, Rel. Haenk. 1: 302. 1830. ‘Hab. in Luzonia.’’? The 
type, in the herbarium of the German University at Prague, is labeled ‘‘Acapulco. 
Haenke.’”’ The specimen in the Bernhardi Herbarium at the Missouri Botanical 
Garden, which is the same species, is from Luzon.¢ 
Panicum carnosum Salzm.; Steud. Syn. Pl. Glum, 1: 60, 1854. This is mentioned 
as a synonym under P. paspaloides, with the citation ‘‘Hrbr. Bahia.’’ There is a 
specimen of this collection in the Trinius Herbarium and another in the United 
States National Herbarium. 
a Panioum affine Nees, Agrost. Bras. 113. 1829. 
6 Trin. Gram. Icon. 2: pl. 168. 1829. 
¢ Scribner, Rep. Mo. Bot. Gard. 10: 46. 1899. 
