PLATE 22 



A. — Longitudinal section of the developing spikelet: g, lower empty glume; g'', 

 upper empty glume; 1, primordium of the lemma or flowering glume of the fertile 

 flower; V, primordium of the lemma or flowering glume of the sterile flower; sf , primor- 

 dium of the sterile flower. X 300. 



B. — Longitudinal section of the developing spikelet: g and g^, empty glumes; 1 

 and V, lemmas or flowering glumes; sf, primordium of the sterile flower; st, stamen 

 of the fertile flower; p, palet of the fertile flower; pp, primordium of the pistil. X 300. 



