Rose hips from Rosa rugosa (beach rose)
Rosehips are the fruits of the rose bush. Prepared (by removing external hairs and seeds) rosehips can be used in various preparations, and are high in vitamin C. They are used in some Herbal Teas, particularly those of a red colouring.
Rose petals also feature in some teas.
For a more comprehensive treatment, see the article on 
Wikipedia.