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Parastichy, in
Smith College
Spiral Lattices & Parastichy
Interactive Parastichies Explorer
Plant morphology {{plant-morphology-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 alterna ...
, 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 cactus, cacti out of which grow clusters of Thorns, spines, and prickles, spines. Areoles are important diagnostic features of cactus, cacti, and identify them as a family distinct fr ...
s on cacti
A cactus (: cacti, cactuses, or less commonly, cactus) is a member of the plant family Cactaceae (), a family of the order Caryophyllales comprising about 127 genera with some 1,750 known species. The word ''cactus'' derives, through Latin, ...
stems, florets in sunflower heads and scales in pine cone
A conifer cone, or in formal botanical usage a strobilus, : strobili, is a seed-bearing organ on gymnosperm plants, especially in conifers and cycads. They are usually woody and variously conic, cylindrical, ovoid, to globular, and have scal ...
s. These spirals involve the insertion of a single primordium
A primordium (; : primordia; synonym: anlage), in embryology, is an Organ (anatomy), organ or tissue in its earliest recognizable stage of development. Cell (biology), Cells of the primordium are called primordial cells. A primordium is the simp ...
.
See also
*Embryology
Embryology (from Ancient Greek, Greek ἔμβρυον, ''embryon'', "the unborn, embryo"; and -λογία, ''-logy, -logia'') is the branch of animal biology that studies the Prenatal development (biology), prenatal development of gametes (sex ...
*
* Gerrit van Iterson ''This page was created from the Dutch Wikipedia with the aid of automatic translation''
Gerrit van Iterson Jr (Roermond, 19 August 1878 – Wassenaar
Wassenaar (; population: in ) is a municipality and town located in the province of South Hol ...
*
* 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 {{plant-morphology-stub