I'm not sure what I was doing when I thought to try this, but I realized that the phytools function phenogram can also be used to plot a neat looking slanted phylogram. This works as follows:
> # we do the following to make sure the tips are
> # in the right order
Obviously, the branches of the tree cross in a couple of different spots, which is no good. If we are determined to plot a tree in this format, we could try rotating the offending nodes above the problematic crossings and then replot our tree:
Some users might note that ape can also plot a slanted phylogram:
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