Tansy (Tanacetum vulgare)

Tansy (Tanacetum vulgare)

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Caption: Tansy flowers (Tanacetum vulgare). Each flower head (yellow) is made up of many individual disc florets. The arrangement of florets around the head is according to a Fibonacci series, a number series in which each number is the sum of the two preceding it, for example 0, 1, 2, 3, 5, 8, 13, 21 and so on.

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Keywords: aromatic, biological, biology, botanical, botany, compositae, fibonacci, flora, flower, flowering, flowers, garden, many, multiple, nature, perennial, plant, plants, sequence, series, tanacetum vulgare, tansy, yellow

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