Google Scholar finds only 3 papers citing the Archer 1997 paper that erected Robsonodendron and I can't see anything in any of those that invalidates/synonymises this genus.
Until proven otherwise I think Robsonodendron should be included in plant_lookup.csv
2 species http://www.theplantlist.org/tpl1.1/search?q=Robsonodendron
Google Scholar finds only 3 papers citing the Archer 1997 paper that erected Robsonodendron and I can't see anything in any of those that invalidates/synonymises this genus.
Until proven otherwise I think Robsonodendron should be included in
plant_lookup.csv