I take the blame for this. In my posting of plants mentioned by Douglas Justice in his December 2020 in the UBCBG garden blog, I wrote: . I am moving further discussion re: common names from that thread to this new thread in an appropriate forum.
Common names Mountain rimu, pigmy pine, pygmy pine. Lepidothamnus laxifolius (mountain rimu) description (conifers.org) Lepidothamnus laxifolius / Pygmy pine | Conifer Species | American Conifer Society commonly known as the pygmy pine or mountain rimu Lepidothamnus laxifolius - Wikipedia
This illustrates the importance of the principle adopted by the Joint Committee, that a common name properly belonging to one genus should not be used for a plant of another genus