Can anyone identify this plant for me?

I have had this plant for years, and I love it. I've searched books, internet databases, used web identifiers, everything, and I can't find it anywhere. It is a great plant. When it is dry it droops like its dead, and you water it and you can actually watch it slowly spring back up. I would love to know what it is called.

 

Might be Pseuderanthemum carruthersii var. atropurpureum 'Tricolor'.

 

Pseuderanthemum atropurpureum
http://toptropicals.com/catalog/uid/Pseuderanthemum_atropurpureum.htm

 

Fantastic! Thank you! =)