GRAIN-SORGHUM EXPERIMENTS IX OKLAHOMA. 
13 
This bulletin treats only of the grain sorghums. The groups of 
the grain-sorghum division may be separated by the following key: 
S pikelets broadly obovate. one-sixth to one-fourth inch wide: seeds 
large, lenticular, flattened: panicle oval-ovate, short branched, com- 
pact MlLO-DURRA. 
Spikelets oval or narrowly obovate. one-twelfth to one-sixth inch wide; 
Is midsized to small, ovoid, scarcely flattened: 
Stems stout, somewhat juicy: internodes short: leaves 12 to 15, 
broad . usually dark green Kafir . 
Stems slender, dry: internodes longer: leaves 7 to 12, narrower and 
lighter green: 
Panicle compressed: glumes tightly appressed to the brown 
or white seeds Kaoliang. 
Panicle conical, loose: glumes spreading, exposing yellowish 
white seed- Shallu. 
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Fig. 4. — Map of the southern Great Plains, showing the average annual precipitation (dotted lines) and 
the number of days in the frost-free period (solid lines). 
Each of the groups is described in the account of the varietal 
experiments, descriptions of the different varieties of each group 
also being given. 
