Japanese Maple, there are many varieties.

Small one on right is a Acer disectum Atropurpureum, You can get neat maples at Marca Dickie Nursery in Boyes Hot Springs, Ca

on left side Japanese maple "bloodgood"

Love this garden! I'm lucky enough to have a large Japanese Maple right in my backyard in Santa Rosa, I'll add some ferns as in your photo and have a beautiful garden. Thank you for posting the photo. By the way Richard, last year I had dozens of baby maple seedlings growing in my garden, do they actually grow into full grown trees or can they be trained to become bonsai Maple trees?