Colchicum corsicum vs. C. cupanii

Jane McGary janemcgary@earthlink.net
Sun, 13 Sep 2015 12:58:27 PDT
Rodger wrote, Does anyone know what the technical distinction is between 
C. corsicum and C. cupanii? Google Images shows a mishmash of plants for 
both names, with no obvious, consistent anatomical differences. I have 
an idea that these small colchicum species may be completely mixed up 
with one another.
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I think they are very confused in cultivation. Without a recent 
monograph on the genus, we all struggle with identifying colchicums. C. 
corsicum can (but doesn't always) show a little tessellation, while 
cupanii never does. The reproductive parts are pretty much identical. I 
think of C. cupanii as having more bowl-shaped flowers and C. corsicum 
flowers as being more "goblet-shaped," but that may just be the plants I 
grow under those names.

I have also received seed identified as C. cupanii that produced 
spring-flowering plants. I don't know what to call them.

A number of Colchicum species, including some I actually trust the names 
on, are flowering here now despite the hot weather. I have a bed along 
the roadside planted end to end with colchicums, and those that are 
shaded by some big fir trees flower all at once (notably, Colchicum 
laetum), earlier than the ones in the sun. I suppose this is caused by 
cooler soil, since colchicums seem to flower in response to temperature 
rather than moisture.

Jane McGary
Portland, Oregon, USA




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