136 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



Panicum sellowii Nees, Agrost. Bras. 153. 1829. "Habitat in Brasilia meridionali. 

 (SellQw)." # The type, in the Berlin Herbarium, has spikelets densely papillose- 

 pubescent with short, stiff hairs. 



Panicum beyrichii Kunth, Rev. Gram. 2: 231. pi. 27. 1830. "Crescit in nemoribus 

 prope novum Triburgum Brasiliee." Kunth states that he received the plant under 

 the name P. sellowii Nees from Beyrich who collected it. The type, in the Berlin 

 Herbarium, has glabrous spikelets as in the type of P. millegrana. 



Panicum lasianthum Trin. Gram. Icoa. 3 : pi. 245. 1830. Trinius states that the figure 

 is "ad specimen Brasilianum." The type, in the Trinius Herbarium, collected in 

 Brazil by Langsdorff, has papillose-hispid spikelets. 



Panicum puberulum Trin. Mem. Acad. St. Petersb. VI. Sci. Nat. 1: 277. 1834, 

 not Kunth, 1829. Trinius states that his specimen is from Brazil. The type, in the 

 Trinius Herbarium, collected in Brazil by Sello, has papillose-hispid spikelets as in 

 the type of P. sellowii. 



Panicum dispersum Trin. Mem. Acad. St. Petersb. VI. Sci. Nat. 1: 282. 1834. 

 Trinius gives the locality as "Bahiens." The type, in the Trinius Herbarium, col- 

 lected in Bahia, Brazil, by Riedel in 1831, is a prostrate or decumbent plant with 

 glabrous spikelets. 



Panicum expansum Trin.; Ste;:d. Nom. Bot. ed. 2. 2 : 256. 1841. This is a nomen 

 nudum credited to "Trin. mpt. Mexico." The type, in the Trinius Herbarium, 

 labeled "Mexico, Hacienda Laguna, Schiede," has glabrous spikelets. This is 

 not the P. expansum of Foura'cra who cites Trinius's name as a synonym under 

 P. rugulosum. t> 



Panicum pilosum leiogonum Eupr. Bull. Acad. Boy. Belg. 9 2 : 239. 1842. This 

 name is listed without description. The only specimen mentioned is Galeotti 5728 

 from Xalapa, Mexico. The type is in the Brussels Herbarium. This name is given 

 by Fournier« as a synonym under P. rugulosum, but Galeotti's no. 5728 he cites c 

 also under P. pilosum genuinum. 



Panicum sellowii longevaginatum Rupr. Bull. Acad. Roy. Belg. 9 2 : 239. 1842. 

 Under this name, which is listed without description, Ruprecht cites two speci- 

 mens, Galeotti 5726 and 5699. 'The first has glabrous, the second hispid spikelets. 

 This name is given by Hemsley^ and Fournier e as a synonym under P. rugulosum. 



Panicum valenzuelanum Rich, in Sagra, Hist. Cuba 11: 304. 1850. "Crescit in 

 locis montosis partis occidentalis insulae Cubae Vuelta de abajo dictae * * * (Don 

 Jose Maria Valenzuela) ." The type, in the Richard Herbarium, labeled "Vuelta de 

 Abajo (Valenzuelana)," has papillose-hispid spikelets. 



Panicum probandum Steud. Syn. PI. Glum. 1 : 76. 1854. Based on "P. puberulum 

 Trin. non Kunth. " 



Panicum rugulosum hirtiglume Griseb. Cat. PI. Cub. 233. 1866. The only speci- 

 men cited is Wright 3455. The type, in the Grisebach Herbarium, has hispidulous 

 spikelets. 



Panicum rugulosum glabrescens Doell in Mart. Fl. Bras. 2 2 : 259. 1877. As no 

 specimen is mentioned, P. beyrichii Kunth, the first synonym cited, is taken as deter- 

 mining the type. 



Panicum rugulosum pubescens Doell in Mart. Fl. Bras. 2 2 : 259. 1877. No speci- 

 men is mentioned. The type of the first synonym cited, P. rugulosum Trin., has 

 glabrous spikelets, while Doell describes his variety as having puberulent glumes, 

 hence the type of the second synonym cited, P. sellowii Nees, which has hispid 

 spikelets, is taken as the type. 



aMex. PI. 2: 26. 1886. <*Biol. Centr. Amer. Bot. 3: 495. 1885. 



& Op. eit. 21. e Mex. PI. 2: 21. 1886. 



cQp. cit. 24. 



