R help - Oct 2010 - Adding legend to lda-plot, using the MASS-package

Hi everyone!
I'm going to analyze the attached data set, but I'm not able to add the
correct legend. In other words, I can't see which species is which.

http://r.789695.n4.nabble.com/file/n2994991/test_discriminant_anal_alle.xls
test_discriminant_anal_alle.xls 

This is my commands:

data<- read.table("clipboard",header=TRUE)
library(MASS)
output<-lda(Species~., data)
scores=predict(output, data)$x
plot(scores, col=rainbow(4)[data$Species], asp=1)

Is there a quick way to add a legend to the plot with the corresponding
colours?

It's probably an easy way to do it, but now I've used too many days on
this...

Thank you in advance, 

Arve L.
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