Issue 18620

Bartlettina is a mess

Reporter: rdmpage
Assignee: mdoering
Type: Feedback
Summary: Bartlettina is a mess
Priority: Major
Resolution: Fixed
Status: Closed
Created: 2016-06-30 08:23:28.899
Updated: 2016-08-02 10:46:33.329
Resolved: 2016-07-29 11:01:46.018
Description: The GBIF map for the plant genus _Bartlettina_ is a mess.

This genus is native to Mesoamercia and South America  but GBIF has lots of records from Europe and Pakistan, as well as others scattered around the globe. Some of these may be introduced (_Bartlettina sordida_ is an ornamental) but some of these records look to be incorrect.

The European records are for _Phagnalon sordidum_ (L.) Rchb. which GBIF somehow thinks is a synonym of _Bartlettina sordida_ (Less.) R.M.King & H.Rob. These names don't have the same basionym, they are clearly different things.

The records from Pakistan are for _Aster molliusculus_ (Lindl. ex DC.) C.B.Clarke which GBIF says is a synonym of _Bartlettina hemisphaerica_ (DC.) R.M.King & H.Rob. As far as I can tell, _Aster molliusculus_ is a valid species found in Asia. The basionym of  _Bartlettina hemisphaerica_ is _Eupatorium hemisphaericum_ var. _molliusculum_ DC.

All in all a confusing mess. It would be nice to know how this was generated, and how we can avoid these situations. Is it the lack of detailed plant name data?]]>

Author: rdmpage
Created: 2016-07-01 07:31:13.616
Updated: 2016-07-01 07:31:13.616
Completely independently a GBIF user has commented about this same genus on iPhylo

I suspect this genus may be a victim of the basionym matching issue (using same species names in different genre in the same family to flag possible problems), but whatever it looks like this large family of plants (Asteraceae) has been badly mangled.

Comment: The new August 2016 backbone has _Phagnalon sordidum (L.) Rchb._ and _Aster molliusculus (Lindl. ex DC.) C.B.Clarke_ as accepted or doubtful taxa sitting in the genus Phagnalon and Aster respectively. Awaiting new occurrence maps to verify Bartlettina occurrences
Created: 2016-07-27 14:32:27.044
Updated: 2016-07-27 14:32:27.044

Created: 2016-07-29 11:01:30.701
Updated: 2016-07-29 11:23:16.405
Having reprocessed all occurrences to the new august backbone there are only 11 occurrences left in Europe:

All of which are Eupatorium sordidum Less. Herbarium specimens. That seems about right:

Author: rdmpage
Comment: Nice! Is this based on an ad hoc fix for this example, or the result of the new nub algorithms?
Created: 2016-07-30 14:25:03.089
Updated: 2016-07-30 14:25:03.089

Comment: This is the result from the less eager basionym grouping, nothing fixed specifically for this problem
Created: 2016-08-01 10:51:24.511
Updated: 2016-08-01 10:51:24.511

Author: rdmpage
Comment: +1
Created: 2016-08-01 12:39:57.343
Updated: 2016-08-01 12:39:57.343

Created: 2016-08-02 10:46:33.329
Updated: 2016-08-02 10:46:33.329
Map looks much better now:

The few European records are ok (see above). Then there are just some 37 Australian/New Zealand records left that might be cultivated/introduced?