122 Chase — Notes on Genera of Panicece. IV. 



Mesosetum loliiforme (Hochst.) Chase, Bot. Gaz. 51 : 302. 1911. Based 

 on Panicum loliiforme Hochst. 



Panicum loliiforme Hochst. in Steud. Syn. PI. Glum. 1 : 56. 1854. 

 " Herbr. Dr. Hostmann nr. 1071." The type specimen is in the her- 

 barium at Leipzig. 



This is the not uncommon Cuban species which has been usually 

 referred to P. rottboellioides in herbaria. It differs from M. rotlboellioides 

 and M. Wrightii in having glumes each bilaterally unsymmetrically 

 developed, the second shorter than the first instead of being the longest 

 scale of the spikelet as in M. rotlboellioides ; M. loliiforme also differs in 

 being sparingly stoloniferous. 



Nees' P. pappofthorum var. /3, bis specimen of which, also collected by 

 Martins in Brazil, is now in the Munich Herbarium, is either M. lolii- 

 forme or a very closely allied species. 



Mesosetum chlorostachyum (Doell). 



Panicum chlorostachyum Doell in Mart. Fl. Bras. 2 2 : 173. pi. 28. A. 

 1877. "Habitat in regionibus numinis Rio Negro (Spruce n. 885, 

 1310)." Spruce's no. 885 is in the Munich Herbarium. 



Mesosetum ferrugineum (Trin.) 



Panicum ferrugineum Trin. Gram. Pan. 1826. " Brasil (Langs- 

 borff)." The type specimen, in the Trinius Herbarium, is labeled 

 "Panicum ferrugineum m. In campis glareosis pr. S. Luzia, Brazil. 

 1. mense Oct. 1824. cl. Lajwsdorff." 



Panicum eriochryseoides Nees, in Trin. Gram. Pan. 160. 1826. This 

 name is given as a synonym of P. ferrugineum. Nees ( Agrost. Bras. 

 103. 1829) publishes this as a new species citing a specimen collected in 

 Brazil by Sellow, "Vidi in Herb. Peg. Berol." What is evidently a 

 duplicate of this is in the Trinius Herbarium. Nees gives "Panicum 

 ferrugineum Tr. in litt." as a synonym of P. eriochryseoides. 



Mesosetum sclerochloa (Trin. ) Hitchc. Contr. Nat. Herb. 12 : 212. 

 1909. Based on Panicum sclerochloa Trin. 



Panicum sclerochloa Trin. Gram. Icon. 3 : pi. 283. 1836. The illustra- 

 tion is drawn "ad specimen Brasilianum." The type, in the Trinius 

 Herbarium, is labeled "Panicum sclerochloa m. pr. Cuyaba febr. 

 1827." 



This peculiar species shows an approach to the species of the section 

 Bifaria in the thickened midnerve of the first glume, keeled toward the 

 apex and protruding as a short, laterally compressed point from between 

 the lobes of the slightly cleft summit of the glume. The midnerve of the 

 second glume and that of the sterile lemma are similarly keeled. 



Besides the species listed above, Panicum lolium Nees, the type speci- 

 men of which has not been examined, and a few other insufficiently 

 known South American species belong in this genus. 



