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Parastichy, in
Smith College
Spiral Lattices & Parastichy
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Plant morphology {{botany-stub
Parastichy, in phyllotaxy
In botany, phyllotaxis () or phyllotaxy is the arrangement of leaves on a plant stem. Phyllotactic spirals form a distinctive class of patterns in nature.
Leaf arrangement
The basic arrangements of leaves on a stem are opposite and alternat ...
, is the spiral pattern of particular plant organs on some plants, such as areole
In botany, areoles are small light- to dark-colored bumps on cacti out of which grow clusters of spines. Areoles are important diagnostic features of cacti, and identify them as a family distinct from other succulent plants. Gordon Rowley - W ...
s on cacti
A cactus (, or less commonly, cactus) is a member of the plant family Cactaceae, a family comprising about 127 genera with some 1750 known species of the order Caryophyllales. The word ''cactus'' derives, through Latin, from the Ancient Greek ...
stems, florets in sunflower heads and scales in pine cone
A conifer cone (in formal botanical usage: strobilus, plural strobili) is a seed-bearing organ on gymnosperm plants. It is usually woody, ovoid to globular, including scales and bracts arranged around a central axis, especially in conifers a ...
s. These spirals involve the insertion of a single primordium
A primordium (; plural: primordia; synonym: anlage) in embryology, is an organ or tissue in its earliest recognizable stage of development. Cells of the primordium are called primordial cells. A primordium is the simplest set of cells capable o ...
.
See also
*Embryology
Embryology (from Greek ἔμβρυον, ''embryon'', "the unborn, embryo"; and -λογία, '' -logia'') is the branch of animal biology that studies the prenatal development of gametes (sex cells), fertilization, and development of embryos and ...
*
* Gerrit van Iterson ''This page was created from the Dutch Wikipedia with the aid of automatic translation''
Gerrit van Iterson Jr (Roermond, August 19, 1878 – Wassenaar, January 4, 1972) was a Dutch botanist and professor who developed a mathematical approach to pl ...
*
* Phyllotaxis
In botany, phyllotaxis () or phyllotaxy is the arrangement of leaf, leaves on a plant stem. Phyllotactic spirals form a distinctive class of patterns in nature.
Leaf arrangement
The basic leaf#Arrangement on the stem, arrangements of leaves ...
References
External links
Smith College
Spiral Lattices & Parastichy
Interactive Parastichies Explorer
Plant morphology {{botany-stub