Rose hips are the seed pods of roses. We don’t often see them anymore, because we tend to prune the faded rose blossoms to encourage more flowers. However if you leave the spent flowers on the rose bush at the end of the season, you should see these small, berry-sized, reddish seed balls, left on tips of the stems. They are actually very ornamental and birds enjoy them too. Both rose hips and rose petals are edible. Roses are in the same family as apples and crabapples, so the resemblance of their fruits is not purely coincidental. Rose hips also have a bit of the tartness of crabapples and are a great source of vitamin C.
Rose Hips - What Are They and What Can You Do With Them?, http://gardening.about.com/od/rose1/f/RoseHips.htm (accessed January 23, 2017).