I'm trying to to italicise some text in a figure caption created by knitr. I have the code below in a .Rnw file and I'm converting it to a .tex file using knitr:
<<plot_setosa, fig.cap="A plot of $\\textit{setosa}$">>=
plot(iris[iris$Species == "setosa",])
@
How can I italicise setosa in the figure caption?