[R] a question about Boxplot

[Liyin Lee]

Dear all,
I have a question about boxplot function in R. 

Is there a way to represent four different groups in the boxplot in
black and white patterns, like adding different shadding patterns for
each box?
The Journal requires figures in black and white patterens rather than
grayscales so that I can not represent groups using different colors.

Thank you very much.

LY