In botany, phyllotaxis is the arrangement of the leaves on the shoot of a plant. This can be alternate, opposite, whorled or in a spiral. In many cases, such as the celebrated case of the sunflower head, phyllotactic patterns involve the golden angle. Also, the number of spirals in a phyllotactic arrangement tend to be Fibonacci numbers. Botany is the scientific study of plant life. ... In botany, a leaf is an above-ground plant organ specialized for photosynthesis. ... A shoot is the fresh young growth of a plant stem. ... Divisions Green algae Land plants (embryophytes) Non-vascular plants (bryophytes) Hepatophyta - liverworts Anthocerophyta - hornworts Bryophyta - mosses Vascular plants (tracheophytes) Lycopodiophyta - clubmosses Equisetophyta - horsetails Pteridophyta - true ferns Psilotophyta - whisk ferns Ophioglossophyta - adderstongues Seed plants (spermatophytes) †Pteridospermatophyta - seed ferns Pinophyta - conifers Cycadophyta - cycads Ginkgophyta - ginkgo Gnetophyta - gnetae Magnoliophyta - flowering plants Adiantum pedatum... Binomial name Helianthus annuus The sunflower (Helianthus annuus) is an annual plant in the Family Asteraceae with a large flower head (inflorescence). ... In geometry, the golden angle is the angle created by dividing the circumference c of a circle into a section a and a smaller section b such that and and taking the angle of arc subtended by the length of circumference equal to b as the golden angle. ... In mathematics, the Fibonacci numbers form a sequence defined recursively by: In words: you start with 0 and 1, and then produce the next Fibonacci number by adding the two previous Fibonacci numbers. ...