Ipheion/Tristagma 'Rolf Fiedler'

Lee Poulsen wpoulsen@pacbell.net
Fri, 13 Apr 2007 12:39:56 PDT
On Apr 12, 2007, at 2:57 PM, totototo@telus.net wrote:
> (The correct
> name for 'Rolf Fiedler' seems to be Tristagma peregrinans. The
> cultivar name remains valid.)

I've seen this name given before. What are the arguments for placing  
'Rolf Fiedler' in the genus Tristagma rather than in Ipheion? Both  
its bulbs, leaves, and flowers are so similar to I. uniflorum that  
it's difficult to distinguish until the flowers open. I would think  
that these two are what I would call sister species. Otherwise, I  
would wonder why I. uniflorum isn't also place in the genus Tristagma.

More generally, I thought Tristagma was mostly a Chilean/Andean  
Argentine genus that looks very similar to Ipheions. I know I'm going  
out on a limb here, but just as Ravenna is claiming (I believe) that  
Rhodophiala bifida and related Argentine/Uruguayan species shouldn't  
be in the same genus as the Chilean and Andean Argentine Rhodophialas  
(which I tend to agree with not that I've seen and grown some of  
both), I think the Chilean and Andean Tristagmas ought to be in a  
different (but related?) genus to all the Ipheions including 'Rolf  
Fiedler'. The one thing that seems to tie them together more closely  
is that despite having a mainly wet warm summer and drier cool winter  
on the eastern half of southern South America, both the Ipheions and  
the Rhodophiala bifida clan still go dormant during the summer and  
grow during the winter as is typical with the mediterranean-climate  
Tristagmas and Rhodophialas of the western half of southern South  
America (aka Chile) which get no rain in summer at all.

--Lee Poulsen
Pasadena, California, USA, USDA Zone 10a

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