How to define variables as categorical using Gower with Daisy

I am using the iris dataset that contains mixed variables (some columns are numeric and some categorical).

iris

     Sepal.Length Sepal.Width Petal.Length Petal.Width    Species
1            5.1         3.5          1.4         0.2     setosa
2            4.9         3.0          1.4         0.2     setosa
3            4.7         3.2          1.3         0.2     setosa
4            4.6         3.1          1.5         0.2     setosa
.
.
.

I am trying to use the Gower metric so that I may specify that some columns contain categorical data.

iris.clust<-daisy(iris, metric = "gower", stand = FALSE, type = list(factor="Species"))

But it is saying that the types= I, I, I, I, N
so obviously it is not reading the variable types correctly.

Could someone please tell me how to specify the variable types correctly?

Thank you.
Joanna