Drops all the leaves from a tree, leaving behind only the structure leading to internal nodes.
drop.leaves(tree, ...)object of class "phylo".
optional arguments. Presently includes only the logical value keep.tip.labels which tells the function how to labels the tips on the reduced tree.
An object of class "phylo".
Revell, L. J. (2012) phytools: An R package for phylogenetic comparative biology (and other things). Methods Ecol. Evol., 3, 217-223.