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
Presidency of George H. W. Bush best president. A 2017 C-Span poll of historians ranked Bush as the 20th best president. Richard Rose described Bush as a "guardian" president, and many other historians and political scientists have similarly described Bush as a passive, hands-off president who was "largely content with things as they were". Historian John Robert Greene notes, however, that Bush's frequent threat of a veto allowed him to influence legislation. Bush is widely regarded as a realist in international relations; Scowcroft labeled Bush as a practitioner of "enlightened realism". Greene argues that the Bush administration's handling of international issues was characterized by a "flexible