This book will help you identify plants with fleshy fruit one inch in diameter or smaller found in Eastern North America. Ripe fruits are described in this book. Most unripe fruits are green or white, and many turn several colors before maturing. Note that this is a plant identification book, not a guide to edible plants.
This book calls all fleshy fruits "berries," whether they are drupes, pomes, accessory fruits, aggregates, or true berries. It includes native species as well as some cultivated species that have escaped to the wild.
A Guide to Native Plants with Fleshy Fruits