[R] removed data is still there!

[pdb]

I'm confused, hope someone can point out what is not obvious to me.

I thought I was creating a new data frame by 'deleting' rows from an
existing dataframe - I've tried 2 methods.

But this new data frame seems to remember values from its parent - even
though there are no occurences.  

Where does it get the values versicolor  and virginica from and give then a
count of 0?

What am I missing?

Thanks in advance. 

> summary(iris$Species)
    setosa versicolor  virginica 
        50         50         50 

> nrow(iris)
[1] 150

> iris1 <- iris[iris$Species == 'setosa',]

> nrow(iris1)
[1] 50

> summary(iris1$Species)
    setosa versicolor  virginica 
        50          0          0 

boxplot(Petal.Width ~ Species, data = iris1, plot=1)

> iris2 <- subset(iris, Species == 'setosa')

> nrow(iris2)
[1] 50

> summary(iris2$Species)
    setosa versicolor  virginica 
        50          0          0 

> boxplot(Petal.Width ~ Species, data = iris2, plot=1)




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