I'm no Nepenthes expert (except with killing them :-( ), but the
"Margaretea" sounds a bit like a marginata (which may be
albo-marginata).  Anyway, from what I can remember about this plant, it
has a sudden transition from green to white?/red?/spotted?  (something
like that - this is from memory, remember and I've never a specimen of
this plant).  However, whatever your Nepenthes are, it sounds like you
get an excellent buy. 
+-----------------------------------------------------------------------------+
|   John Taylor  [The Banshee]   |   Royal Melbourne Institute of Technology  |
|   rphjt@minyos.xx.rmit.oz.au   |        Department of Applied Physics       |
|   MOKING IS A HEALTH HAZARD.   |        Melbourne, Victoria, AUSTRALIA      |
+-----------------------------------------------------------------------------+