156 



Chase — Notes on Genera of Panicece. IV. 



1825. Based on 



1841. Based on 



Based on "Op- 



cano.)" A duplicate type, received from Humboldt, was examined in 

 the Willdenow Herbarium. Of the specimens in the National Herbarium 

 Prinyle 8622 is an excellent match for this. The other specimens mostly 

 have longer awns. 



Orthopogon holciformis Spreng. Syst. Veg. 1 : 307. 

 " Oplismenus holciformis Kunth." 



Panicum holciforme Stench Nona; Bot. ed. 2. 2: 257 

 Oplismenus holciformis H. B. K. 



Berchtoldia holciformis Fourn. Mex. PL 1 : 41. 1886 

 lismenus holciformis H. B. K." 



28. Gexus CHAETIUM Nees. 



Chaetium Nees, Agrost. Bras. 269. 1829. This genus is based on a sin- 

 gle species, C. festucoides Nees (op. cit. 270), 

 "Habitat in graminosis et in cultis ad flumen S. 

 Francesci, ad Joazeiroetc. Provinciarum Pernam- 

 bucanae et Bahiensis." The type specimen, in the 

 Munich Herbarium, bearing the data as published, 

 was collected by Martius. 



Berchtoldia Presl, Rel. Haenk. 1 : 323. pi. 43. 

 1830. A single species is included in the genus, B. 

 bromoides Presl. (op. cit. 324). " Hab. in Mexico." 

 A part of the type specimen was examined in the 

 Trinius Herbarium. 



Both Nees and Presl place their proposed genera 

 next after Oplismenus. 



Kunth (Enum. PI. 1 : 146. 1833) places Chaetium 

 festucoides in Oplismenus but to Berchtoldia he gives 

 generic rank. After the generic description he adds 

 "(Charact. gen. ex Presl.)" It is probable that 

 Kunth had not seen either species, but that from 

 the plate in Presl's work he recognized Berchtoldia 

 as distinct from Oplismenus. 



Steudel (Syn. PI. Glum. 1:48. 1854) places 

 Chaetium in Panicum, section Echinochloa under 

 the name P. chaetium, and gives (op. cit. 117) 

 Berchtoldia generic rank, as did Kunth, and doubt- 

 less for the same reason. 



Doell (Mart, Fl. Bras. 2 2 :150. 1877) makes 

 Chaetium a section of Panicum with the single 

 species P. chaetium Steud. In the observations 

 (op. cit. 150) he mentions as belonging in this 

 section Berchtoldia bromoides Presl, to which he 

 wives the name Panicum berchtoldium. Under P. 

 chaetium he mentions as an extra-Brazilian speci- 

 men Wright 735 from eastern Cuba. This number 

 is the type of " Perotis f cubana" Wright, Chaetium cubanum (Wright) 



Hitchc. 



Bentham (Linn. Soc. Journ. Bot. 19 : 46. 1881; Benth. & Hook. Gen. 



Fig. 17. 



Chaetium festucoides. 



(Two views of spikelet 



and fruit x f> diam.) 



