Rose comprises an outer fleshy layer, the hypanthium, which contains 5–160 "seeds" (technically dry single-seeded fruits called achenes) embedded in a matrix of fine, but stiff, hairs. Rose hips of some species, especially the dog rose ("Rosa canina") and rugosa rose ("Rosa rugosa"), are very rich in vitamin C, among the richest sources of any plant. The hips are eaten by fruit-eating birds such as thrushes and waxwings, which then disperse the seeds in their droppings. Some birds, particularly finches, also eat the seeds. While the sharp objects along a rose stem are commonly called "thorns", they are technically prickles—outgrowths of
Rose is a rose is a rose is a rose the rose is red for the first time in English poetry for a hundred years." ("Four in America"). She herself said to an audience at Oxford University that the statement referred to the fact that when the Romantics used the word "rose", it had a direct relationship to an actual rose. For later periods in literature this would no longer be true. The eras following romanticism, notably the modern era, use the word rose to refer to the actual rose, yet they also imply, through the use of the word, the archetypical elements of the romantic era. The following lines