The following quotation is from 'An ear to the ground. Garden science for ordinary mortals' by Ken Thompson, published by Transworld Publishers.
"Do not be afraid of Latin. It is the specialized jargon of gardening, and part of the fun of any hobby is getting to grips with the jargon, if only so you can show off to those who know less. Do not be put off by difficult pronunciation - nobody knows how Latin should be pronounced except the Romans, and they aren't around to argue. And if you want to buy a Paeonia mlokosewitschii, just point......"
As an addendum, I hadn't heard of the above Peony for several years. Known as the Caucasian Peony we used to get around its tongue-twister of a name by calling it Molly the Witch.