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  2. Phyllotaxis - Wikipedia

    en.wikipedia.org/wiki/Phyllotaxis

    Alternate distichous leaves will have an angle of 1/2 of a full rotation. In beech and hazel the angle is 1/3, [citation needed] in oak and apricot it is 2/5, in sunflowers, poplar, and pear, it is 3/8, and in willow and almond the angle is 5/13. [6] The numerator and denominator normally consist of a Fibonacci number and its second successor ...

  3. Glossary of botanical terms - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_botanical_terms

    The upper angle between one part of a plant and another, e.g. the stem and a leaf. axile On an axis; of a placenta, on the central axis of the ovary. axillary Borne in or arising from the axil, usually referring to the axil of a leaf. axis The main stem of a whole plant or inflorescence; also, the line along which this stem extends.

  4. Logarithmic spiral - Wikipedia

    en.wikipedia.org/wiki/Logarithmic_spiral

    In several natural phenomena one may find curves that are close to being logarithmic spirals. Here follow some examples and reasons: The approach of a hawk to its prey in classical pursuit, assuming the prey travels in a straight line. Their sharpest view is at an angle to their direction of flight; this angle is the same as the spiral's pitch. [7]

  5. Leaf - Wikipedia

    en.wikipedia.org/wiki/Leaf

    One leaf, branch, or flower part attaches at each point or node on the stem, and leaves alternate direction—to a greater or lesser degree—along the stem. Basal Arising from the base of the plant. Cauline Attached to the aerial stem. Opposite Two leaves, branches, or flower parts attach at each point or node on the stem.

  6. Tree allometry - Wikipedia

    en.wikipedia.org/wiki/Tree_allometry

    where Y is a biological variable (such as tree height or DBH), β is a proportionality coefficient, α is the scaling exponent (which is equal to the slope of the line when plotted on logarithmic coordinates), and X is some physical measure such as body volume or body mass(M).

  7. Plant stem - Wikipedia

    en.wikipedia.org/wiki/Plant_stem

    A stem is one of two main structural axes of a vascular plant, the other being the root. It supports leaves , flowers and fruits , transports water and dissolved substances between the roots and the shoots in the xylem and phloem , engages in photosynthesis, stores nutrients, and produces new living tissue. [ 1 ]