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I’m exporting the following document to LaTeX

#+BEGIN_SRC R :results table :exports results :colnames yes :rownames yes
  x <- data.frame(a=1:2, b=3:4)
  rownames(x) <- c("One:", "Two:")
#+END_SRC

and expect a table with the following layout:

     a b
One: 1 3
Two: 2 4

Instead I got this:

   x
 1 One:
 2 Two:

Here’s the LaTeX code:

\begin{tabular}{rl}
 & x\\
\hline
1 & One:\\
2 & Two:\\
\end{tabular}

Emacs  : GNU Emacs 25.0.50.5 (x86_64-unknown-linux-gnu, GTK+ Version 3.10.8)
 of 2015-05-12 on montana
Package: Org-mode version 8.3beta (release_8.3beta-1157-g8ddb84 @ /home/malsburg/usr/share/emacs/site-lisp/org/)