#phyllotaxy

[spyrogif]

[geometrymatters]

Geometry at work: Sea animals, Fruits and Vegetables and Plants

The Nautilus

The nautilus (from the Latin form of the original Ancient Greek ναυτίλος, 'sailor') is a pelagic marine mollusc. Although not a golden spiral, the nautilus shell presents one of the finest natural examples of a logarithmic spiral.

Geometry of fruits and vegetables

When sliced in half, the majority of the depicted fruits and vegetables will display a geometric shape or pattern, based on symmetry or platonic solids.

The arrangement of leaves

Phyllotactic spirals form a distinctive class of patterns in nature, depicting the  arrangement of leaves on a plant stem. The basic patterns are alternate, opposite, whorled or spiral, many of them arranged based on consecutive fibonacci numbers.

[spyrogif]

[spyrogif]

[spyrogif]

[geometrymatters]

Phyllotaxy - the arrangement of leaves

Phyllotactic spirals form a distinctive class of patterns in nature, depicting the arrangement of leaves on a plant stem. The basic patterns are alternate, opposite, whorled or spiral, many of them arranged based on consecutive fibonacci numbers.

[whats-in-a-sentence]

Three basic phyllotactic patterns, termed alternate, decussate (opposite), and spiral, can be directly linked to the pattern of initiation of leaf primordia on the shoot apical meristem (Figure 17.32). (...) As we discussed in Chapter 17, polar auxin transport in the L1 layer of the SAM is essential for leaf primordia emergence, and is responsible for leaf phyllotaxy (the pattern of leaf emergence from the stem; see Figure 17.32).

"Plant Physiology and Development" int'l 6e - Taiz, L., Zeiger, E., Møller, I.M., Murphy, A.

[turnedtowormwood]

An alternate reality where opposite and whorled don’t exist.