Spikelets (no. of florets and sexuality)

                   

 2-flowered, lower male or barren, upper fertile                    2-flowered, both fertile 

                                       

                                             1-many flowered, with 1 fertile floret

               

many flowered, with at least 2 fertile                                       1-flowered

Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith