Like most generalizations, the "no blue orchid" is not quite accurate. "Coerulea" orchids indeed aren't really blue... more of a violet. But there ARE some really neat, truly blue orchids... check out Cleisocentron merrillianum and Cleisocentron gokusingii. And several of the Thelymitras. http://orchidcentral.org/Images/Disa...aucophylla.jpg and Southern California Orchid Species Society Blue Thely The rarity of the "real" blue color makes these even more special. I can vouch for the accuracy of the colors... most are mine, the group from the Southern California Orchid Species Society site is from a friend who also vouches for the colors.
Ehhhhh it's like 97% true lol. With extremely few exceptions, you won't see orchids that are a "true" blue, like a cornflower:
Almost all blue orchids are a shade of purple. There's a few species out there that have a blue gene, but I think almost all the common orchid genera in the hobby don't have this gene.