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Parastichy
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<p>Parastichy, in <a href="/facts/Phyllotaxy/8xGtgllo">phyllotaxy</a>, is the spiral pattern of particular plant organs on some plants, such as <a href="/facts/Areole/tt7AtkS7">areoles</a> on <a href="/facts/Cacti/JTf3NFBj">cacti</a> stems, florets in sunflower heads and scales in <a href="/facts/Pine_cone/rqHh3fVu">pine cones</a>. These spirals involve the insertion of a single <a href="/facts/Primordium/6cjIKxtY">primordium</a>. </p>