How to use Hansen & Rahn interactive key for plant families
Open R, then type:
> library(shipunov)
> example(hrahn)
you will start the interactive key.
To know more about it, type
> ?hrahn
To use above, you are supposed to know some basics of
R. If you want to know more, read, for example, my
"Visual Statistics. Use R!" (please google the title).