[R] remove black square from factor plot

[fugelpitch]

I have a factor which is species and the variables are a few sites where this
species live.

When I plot:

plot(species.factor, minlatitudemaxlatitude)

the plot produced is automatically a boxplot which shows the range of the
species (which is what I want).
However, in the thin box which is produced by each species, there is a small
black square in "center position" of the box. Is it possible to remove this.
Have tried to include bxp(par(medpch=NA)) without success.


Thanks!

Jonas Josefsson 
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