Memoir 10 
Plate III 
2 
TYPES OF SPIKELETS AND BASES OF OUTER GRAINS 
1, Avena sativa orientalis. A, the complete spikelet, with its glabrous lemmas and reduced awns; 
B, base of the outer grain, showing its non-articulate surface and its rhachilla from which the inner 
grain easily separates 
2, Avena brevis. A, the complete spikelet, showing toothed projections of the lemma; B, base of 
the outer grain, showing its non-articulate surface and its rhachilla from which the inner grain easi'v 
separates 
