Palm sedge question
 

I wonder if anyone could enlighten me - variegated palm sedge 'Oehme' and
cultivars named 'Variegata' or 'Aureovariagata' - are they the same plant?
Or are there _any_ separate variegated cultivars of this sedge other than
'Oehme'? (I have googled, BTW, and 'Variegata' comes up in a handful of
Swedish, German, Russian, Belgian and lots of Polish pages. Nowhere else -
so I think the name might not be correct).

And another question - can you recommend some reference book on grasses,
sedges and the like? I have Darke's Encyclopedia and it is excellent - but
perhaps you have come across something more comprehensive yet?

Regards, Barbara.

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