R help - Mar 2014 - Customise a symbol in a scatterplot with for loop

Hi, 
I have the code below to generate a pentagon in R.  I have generated a
regular scatterplot and need to draw a scatterplot with a pentagon at each
(x,y) position, for the radius use r x 0.3.  The hint I've been given is
that I do not need to store the polygons in a list, simply construct and
draw the polygons within a for loop.  Four hours have gone by and I'm no
closer, so any help would be appreciated.  My original scatterplot code is 

plot(Sepal.Width~Sepal.Length, data=iriss)

mk_pent<-
 function(x,y,r){
  angle<-(0:4)*360/5+90
  angle<-angle*pi/180
  xs<-r*cos(angle)+x
  ys<-r*sin(angle)+y
 cbind(x=xs,y=ys)}

Thanks
A




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