[R] Identify groups by character point in xyplot legend

[nmset]

http://www.nabble.com/file/p24173983/groups.csv groups.csv 
http://www.nabble.com/file/p24173983/groups.r groups.r 

Hello,

Points of an xyplot can be identified to a particular group according to
'sunflowers', a different one per group. However, this distinction does not
appear in the legend generated by auto.key, all groups are expressed as a
point or line, of different colours, but without 'sunflowers'. The
distinction between groups is readily made when there are few groups, but
not when there are many.

Is there a way to differentiate groups in the legend by the corresponding
'sunflowers' in the plot region ?

The attached files would expose the problem graphically.

TIA.

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