the meaning behind a white rose:
-White: Purity, Innocence, Silence, Secrecy, Reverence, Humility, Youthfulness, I am worthy of you, Heavenly
(
http://www.rkdn.org/roses/colors.asp)
-A white rose means purity, innocence, secrecy, silence and "you're heavenly".
(
http://www.naute.com/sendarose/whiterose.phtml)
-White Roses:
Pure white roses symbolize truth and innocence. They also send other messages: "I miss you" and "You're heavenly."
(
http://honeymoons.about.com/cs/valentinesday/a/Valentine_Roses.htm)
-White has long been a sign of innocence or purity and this holds true when considering roses. Sending a white rose means you believe someone to be heavenly and also represents feelings of respect as well as love.
(
http://www.rosesbydesign.co.uk/rose_colour_meaning.php)
A single rose means simplicity.