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VASCAN data issue management
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recognition of Potamogeton berchtoldii ssp. berchtoldii #2811

Closed MichaelOldham closed 4 years ago

MichaelOldham commented 6 years ago

http://data.canadensys.net/vascan/taxon/30810?lang=en

Seems somewhat inconsistent to recognize P. gemmiparus at the species level, but not P. clystocarpus (endemic to TX, recognized at the species level by FNA and most other recent workers, including B. Hellquist [pers. comm. 2012)}. If P. gemmiparus and P. clystocarpus (e.g. see attached) are recognized as full species, then no need for ssp. berchtoldii.

Mike Oldham Kaplan et al 2013_Revision of chromosome numbers of Potamogetonaceae, a new basis for taxonomic and evolutionary implications.pdf Whittall et al 2004_Cryptic species in an endangered pondweed community (Potamogeton, Potamogetonaceae) revealed by AFLP markers.pdf

brouille commented 4 years ago

Les et al 2009 (Syst. Bot.) placed gemmiparus as subsp. of berchtoldii, which molecular data support better than species status, even those of Kaplan. This is what VASCAN is recognizing currently. I am not changing this. Lux