We say it either puh-lep-ter-us or poly-tare-us, and its either birch-er or just plain *****-er, but i think people just really wanna be able to say it like that.
it comes from french african, so ch "sh" in sound but whn trans into inglish it come towsghughurawgh3ri
just read one of annes posts it totally cover it.
Though i say it as 'bee - ch'r', I think the 'ch' is sometimes pronounced by others as 'k' because of...
Monarch, Patriarch, Anarchist, Heirarchy, Brachiosaurus, etc.