The name of this Poppytrail pattern is "California Ivy" by Metlox. I have several pieces for sale if you are looking to complete your set. This pattern has been out of production for 20 years. It was manufactured from 1946-1986. See how decorative "California Ivy" is on display in the photo below, as it is in my kitchen.
This is the 10 3/8" dinner plate. It is in excellent vintage condition.
Price includes US SHIPPING with delivery confirmation. Shipping charge quoted is for insurance only.