Using the Open Tree of Life for your Research, R section: Instructor Notes

6.1 Get source trees with branch lengths

Extra! Try it yourself.

chronograms <- rotl::studies_find_trees(property = "ot:branchLengthMode", value = "ot:time", verbose = TRUE, detailed = TRUE)
class(chronograms)
names(chronograms)

We should be able to use list_trees() to get all trees matching our criteria.

rotl:::list_trees(chronograms)

Except, it does not really work.