Usually i get confused when i search in the KEW'S PLANT LIST. I feel that it contains a lot of mistakes AND ESPECIALLY IN THE ACCEPTED NAME AND THE SYNONYMS.
Taxonomy is a tricky affair. You cannot say plant list at Kew is full of mistakes. I hope the problem is because of changes happening in taxonomy and nomenclature. Sometimes, a species is dropped from a particular family and put in another one. Sometimes, a species is dropped from a genus and accommodated in another genus or even a new genus is created. Species names are also changed paving the ways for synonyms. You should always be aware of these developments!
I am always aware of the international developments and i totally agree with what you have said C George Thomas, but i am not talking about these things that you mentioned. I am talking about their synonyms. I don't accept a lot of their considerations for some species as NOT ACCEPTED when indeed in our field work it is CLEEEEEAR THAT THEIR ARE HUGE DIFFERENCES BETWEEN THEM.
In the past Kew also provided data for international programmes run independantly of Kew like CoL (www.catalogueoflife.org), TROPICOS (www.tropicos.org) and TPL (http://www.theplantlist.org/), this last one has not been updated since 2013. As these are indipendant, Kew has no control over how often these are updated or what these organisations do with their data. So please be accurate on the databases you use so as not to confuse readers.
This is your opinion and I have mine and I am not confusing the readers. The matter is that there is a difference between gathering a data only, and working at the field and fixing mistakes for those who only gather the information. I think i have cleared my point of view, and by the way, I am not the only one who is complaining ............... Rafaël Herman Anna Govaerte
Probably you are telling about The Plant List. Yes it has errors in the accepted names and synonyms. Actually it is a very difficult task to always provide the current accepted names when many are frequently changing. Accepted names may also vary upon onces taxonomic concept.
To me The Plant List is useful, at least it gives a clue about the various names of a species.
Yes there are many problems in synonyms, unresolved and accepted names in The Plant List.
Case 1. Inula cappa (Buch.-Ham. ex D.Don) DC. is an unresolved name in the plant list with Conyza cappa Buch.-Ham. ex D. Don as basionym.
Case 2. Duhaldea cappa (Buch.-Ham. ex D.Don) Pruski & Anderb. is an unresolved name with Conyza cappa Buch.-Ham. ex D. Don as basionym.
It is not possible that there is 2 plants with common basionym. Now Inula cappa (Buch.-Ham. ex D.Don) DC. is synonym of Duhaldea cappa (Buch.-Ham. ex D.Don) Pruski & Anderb. in plant of the world online.
As any scientific effort to regulate the taxonomy of any group, specially plants, has its limitations. In the particular case of The Plant List (http://www.theplantlist.org/) site in which Kew is the main institution who provides technical support is no longer updated since 2012. The aim of this site was intended from 2002-2010as one of the targets for the Global Strategy for Plant Conservation. If you want to see more updated information (also with discrepancies) you can search in the World Flora Online (http://www.worldfloraonline.org/) which is the actual taxonomic backbone for plants. This sites was supposed to be the reference in the 2011-2020, but is actual useful since there is no an actualization for the function it performs.
Yo can also cosult APG Web Site (http://www.mobot.org/MOBOT/research/APweb/) to see updated information to family level, and across this criteria find specialized literature with recent taxonomical treatment for the group you are interest in.