Cistanche, phylogeny and revision
The results of this thesis revolutionize some parts of the Cistanche taxonomy:
https://bonndoc.ulb.uni-bonn.de/xmlui/bitstream/handle/20.500.11811/7286/4882.pdf
In particular, chapter 4 (page 57 or 45) and the key (page 71 or 59) are extremely interesting.
There are some newly-described taxa that have received no formal description so far.
