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http://www.aquaticplantcentral.com/...details.php?id=203&category=genus&spec=Rotala

I found out the other day that Rotala pusilla is no longer a valid name and hasn't been for quite some time. It's a synonym for Rotala mexicana. That's right. I found something about it in the following two links my research in the herbarium and botanical library today seems to validate that.

Apparently there are only two described Rotala species in all of South America: R. mexicana and R. ramosior. I believe there's another in Mexico, but apart from the introduced R. indica and R. rotundifolia, that's it. R. mexicana is found all over the world in warm areas, so it makes sense that the Australian form we've been salivating over might not look quite the same.

Do I go ahead and make the change? As what? The plant in question is apparently the same thing as Rotala sp. 'Araguaia' and has been presented as R. pusilla. Also, I've seen green Australian R. mexicana in person and it looks not all that different. List it as Rotala mexicana 'araguaia'? I think I'm justified here but just need the final nudge. It's either that or we flower it and send off a specimen to a Acanthaceae specialist.

http://www.efloras.org/florataxon.aspx?flora_id=3&taxon_id=200014665
http://www.ipni.org/ipni/idPlantNam...wholeName=rotala+pusilla&output_format=normal
http://www.aluka.org/action/showMetadata?doi=10.5555/AL.AP.FLORA.FZ3677&pgs=

Note: Look below the main title on the last link.
 

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Actually, the one traded as Rotala sp. 'Araguaia' now no longer looks like pusilla. It looks like this:(the red one in the back)



If you're sure that pusilla is mexicana I would simply change it to mexicana or maybe mexicana 'South America' if anything to avoid confusion.
 

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Discussion Starter #5
Touche' for you or me? :)

How about listing it as Rotala mexicana (?) 'South America' or 'South American form'?
 

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Touche' for you or me? :)

How about listing it as Rotala mexicana (?) 'South America' or 'South American form'?
Yeah, I think that's the best solution to avoid confusion. Sort of like the different verticillate inclinatas.
 

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Discussion Starter #7
Have a gander at it now. Does it sound wishy washy? I want it the represent me being cautious and not wanting to sow confusion, not being unsure and going on a whim.

P.S. It's entirely possible that 'Goias' is also R. mexicana.
 

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I took out the wishy-washy part and have retained it here. It would be at the end of the first paragraph. If I feel the need to support all that, I can do it somewhere else. What follows breaks from the semi-formal style a bit too much anyway.

There are only two described Rotala species in South America (the other being the dissimilar R. ramosior), but the question mark concerning the name will be retained for the time being to include the unlikely possibility that the plant in question is unknown.
 

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