46 BULLETIN 772, U. S. DEPARTMENT OF AGRICULTURE. 
Type species: Briza eragrostis L. 
Eragrostis Host, Gram. Austr. 4: 14, pl. 24. 1809. One species is described, 
but no generic description is given. The genus Eragrostis was first diagnosed 
by Beauvois,* the type being 
Eragrostis eragrostis, based on 
Poa eragrostis L. ia, 
Erochloé 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 seu 
amabilis,’ (Hragrostis pectina- 
cea and #. 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 Hragrostis sessilispica Buckl., 
the only species described. The 
genus is placed in Chlorides on 
account of the sessile spikelets 
distant along the panicle 
branches. 
Neeragrostis Bush, Trans. 
Acad. St. Louis 18: 178. 1908. 
The type species is indicated, 
Poa weigeltiana Reichenb. The 
genus includes also NV. hypnoides 
(Hragrostis hypnoides). 
Erosion Lunell, Amer. Midl. 
Nat. 4: 221. 1915. Proposed for 
“ Hragrostis Beauv... . The 
name to be avoided, as built on 
another grass name.” 
Fig. 14.—Quaking grass, Briza media. Plant, * 4; 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 
1Ess. Agrost. 70, pl. 14, f. 11. 1812, 
