46 



BULLETIN 772, U. S. DEPARTMENT OF AGRICULTURE. 



Type species : Brisa eragrostis L. 



Eragrostis Host, Gram. Austr. 4: 14, pi. 24. 1809. One species is described, 

 but no generic description is given. The genus Eragrostis was first diagnosed 



by Beauvois, 1 the type being 

 Eragrostis eragrostis, based on 

 Poa eragrostis L. 



Erochloe Raf., Neogenyt. 4, 

 1825; Bull. Bot. Seringe 1: 221. 

 1830. Rafinesque first proposed 

 the name in 1825 but mentioned 

 no species. In 1830 he gives the 

 name to " Poa spectabilis sen 

 amabilis," (Eragrostis pectina- 

 cca and E. amabilis, respec- 

 tively, not the same species, as 

 Rafinesque implies). 



Acamptoclados Nash, in Small, 

 Fl. Southeast. U. S. 139. 1903. 

 The type, indicated on page 1327, 

 is Eragrostis sessilispica Buckl., 

 the only species described. The 

 genus is placed in Chloridese on 

 account of the sessile spikelets 

 distant along the panicle 

 branches. 



Neeragrostis Bush, Trans. 

 Acad. St. Louis 13: 178. 1903. 

 The type species is indicated, 

 Poa iccigeltiana Reichenb. The 

 genus includes also 2V. Jiypnoides 

 ( Eragros Us liypnoides ) . 



Erosion Lunell, Amer. Midi. 

 Nat. 4: 221. 1915. Proposed for 

 " Eragrostis Beauv. . . . The 

 name to be avoided, as built on 

 another grass name." 



FIG. 14. Quaking grass, Briza media. Plant, X \ ', spikelet and floret, X 5. 



In many species the rachilla is continuous and does not disarticulate 

 as in most species of the tribe Festuceae. The grain is free and falls 

 with the lemma, leaving the palea upon the rachilla. To this group 



1 Ess. Agrost. 70, pi. 14, f. 11. 1812. 



