The entries here on ATP/NGA were likely made before the changes on The Plant List. The Catalogue of Life is used here for some reason, but these official sites use the same sources and are all linked to The Plant List.
The C of L hasn't been updated, there is every reason to take the records of the latest updates on The Plant List.
The IPNI (International Plant Names Index) appears to be the ultimate resource and that should always be checked on every 'accepted' entry searched on The Plant List as well as cross checking the entries on the C of L. I imagine the C of L might at times have been updated when The Plant List hasn't but somehow I doubt that. The C of L doesn't link to the IPNI, it does quote the same resources from the IPNI though.
The resource used on the C of L for example, for
Asimina spatulata is:
http://herbarium.botanik.univi...
which gives
Ward, D. B. (2001) Novon 11 (3): 360
(left out the bits to do with collector notes)
≡ syn. Asimina longifolia· Kral var. spatulata Kral
Kral, R. (1960) Brittonia 12: 266. fig. 9 a-b
http://www.catalogueoflife.org...
The Plant List resource for
Asimina spatulata is the IPNI:
http://www.theplantlist.org/tp...
The last entry on the IPNI under Record History which states "Barker: (A) Linked to BHL made on 2014-06-07 02:39:27.0 " I noted brought up a different entry when you click on it to the other two entries in the Record History, it comes up near the top and states "Novon 11(3): 360. 2001 [Read the protologue in BHL]."
http://www.ipni.org/ipni/plant...
The link which explains it! So yes, the two species as accepted on The Plant List are the most recent and in my opinion should be taken as correct.
http://www.biodiversitylibrary...
I took a snip:
