The sunflower's scientific name is Helianthus from helios (sun) and anthos (flower). One of the common species is named annuus because it is an annual plant which grows for just one year and is then replaced by new plants from seed.
Sunflowers are part of the daisy family which was called Compositae, because they have composite flower heads - their heads are not one flower but hundreds of little flowers, each of which can form a new seed!
They are arranged in a beautiful geometric concentric pattern. The geometric pattern is one which is found in several places in nature, following what mathematicians call Fibonacci numbers - where each number is the sum of the two numbers before it (such as 1, 2, 3, 5, 8, 13, 21 and so on..).
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