16 BULLETIX G22, U. -S. DEPARTMENT OF AGEICL^LTrRE, 
KEY TO THE SUBVARIETIES. 
1. Hordeum vulgare pallidum Seringe (1841, p. 346). 
Outer glumes narrow. 
Kernels white. 
Awns rough. 
Spike narrow, lax, nodding 1 typita. 
Spike wide, dense, the edges parallel ; awns not widely spread- 
ing parallelum Kornicke (as var., 1882, p. 166). 
Spike wide, very dense, pyramidal, awns -widely spreading. 
pyramidatum Kornicke (as var., 1882, p. 164). 
Awns smooth. 
Spike narrow, lax, nodding. 
rikotense Kegel (as var., 1908, p. 74). 
Kernels bluish. 
Awns rough. 
Spike narrow, lax, nodding. 
coeruJescens Seringe (as var., 1841, p. 347). 
Kernels purple. ^ 
Awns rough. 
Spike narrow, lax, nodding. 
suhviolaceum Kornicke (as var., 1895, p. 9). 
Outer glumes wide. 
Kernels white. 
Awns rough. 
Spike narrow, lax, nodding. 
, latiglumatum Kornicke (as var., 1895, p. 9). 
Spike wide, dense, erect, 
eurylepis. Kornicke (as var., 1882. p. 167). 
2. Hordeum vulgare nigrum Willdenow (as sp., 1809, p. 1037). 
Outer glumes narrow. 
Awns rough. 
Spike narrow, lax, nodding — typica. 
Spike wide, dense, erect. 
selumperianum Kornicke (as var.. 1882, p. 165). 
Awns smooth. 
Spike narrow, lax, nodding. 
lelorrhyncMmi Kornicke (as var., 1882, p. 178). 
Outer glumes wide. 
Awns rough. 
Spike narrow, lax. nodding. 
atrospicaium Kornicke (as var,, 1895, p. 9). 
Spike wide, dense, erect platylepis Kornicke (as var., 1895, p. 9). 
3. Hordeum vulgare horsfordiunum ^Yittm-dck (1884). 
Outer glumes narrow. 
Kernels white. 
Spike narrow, lax, nodding typicu. 
Spike wide, dense, erect. 
hexasticofurcatum K. H. in Beaven (as var., 1902, p. 577). 
4. Hordeum vulgare atrnm Kornicke (1895, p. 9). 
Outer glumes narrow. 
Spike narrow, lax, nodding : typica. 
Spike wide, dense, erect. 
densifurcatum K. H. in Beaven (as var,, 1902, p, 577). 
