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 9. P. barbinode. 



Nodes glabrous. 



Spikelets 3 mm. long; glumes and sterile lemma papery 8. P. paludivagum. 



Spikelets not over 2.4 mm. long; glumes and sterile lemma 



not papery 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 Fe de 

 Bogota. Ab amiciss. Zea nobiscum communicata." This specimen has not been 

 examined, but the form to which Nees a 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. Sieber in hb. Maur. I. I. no. 28.) e 

 Brasil. — s. nom. Panic, affine Schult. — N. ab Esenb." 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. 



t 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. c 



Panicum carnosum Salzm.; Steud. Syn. PI. Glum. 1: 60. 1854. This is mentioned 

 as a synonym under P. paspaloidcs, with the citation "Hrbr. Bahia." There is a 

 specimen of this collection in the Trinius Herbarium and another in the United 

 States National Herbarium. 



« Panicum affine Nees, Agrost. Bras. 113. 1829. 



6 Trin. Gram. Icon. 2 : pi. 168. 1829. 



c Scribner, Rep. Mo. Bot. Gard. 10: 46. 1899. 



