PEDICELED ONE-FLOWERED SPIKELETS 53 



the lemma; the two nerves may be coherent, appear- 

 ing as one, or widely separated with the delicate 

 internerve splitting. The rachilla may be extended 

 beyond the base of the palea, a vestige of the sup- 

 pressed florets, or it may be produced into a sharp 

 callus below the lemma. The inflorescence is always 

 a panicle, but this may be diffuse or dense and 

 cylindrical or capitate (like a head). 



REVIEW 



Collect panicles of redtop, timothy, or of any grass with 

 laterally compressed l-flowered spikelets. If the inflorescence 

 is dense, distinguish the individual spikelets. Dissect the 

 spikelets and note whether any of the organs are suppressed. 

 Note the point of attachment of the awn, if any. 



If possible, collect panicles of any species of Stipa. Lay a 

 few of the florets in a httle water and note the result. Note that 

 twisted awns or the twisted parts of an awn are flattened. 



