There is a beautiful orchid called Maureen Carter on this link
http://cmausteller.blogspot.com/2009/01/cymbidium-maureen-carter.html
Look in the RHS website 'Plant finder' there are 4 stockists listed of the Clematis Maureen.

There is a tulip called "Maureen". It's white.

The RHS Plantfinder shows 14 different plants either named 'Maureen' or with Maureen in their name, of which Clematis 'Maureen' (as mentioned by Scotsgran) is the most widely available - cut and paste the following into your browser for full info:

http://apps.rhs.org.uk/rhsplantfinder/showallrecords.asp?crit=maureen