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Reference.org
Phyllotaxis
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<p>In <a href="/facts/Botany/PaIRoxnb">botany</a>, phyllotaxis or phyllotaxy is the arrangement of <a href="/facts/Leaf/1m6wCNTg">leaves</a> on a <a href="/facts/Plant_stem/QlQWSzV4">plant stem</a>. Phyllotactic spirals form a distinctive class of <a href="/facts/Patterns_in_nature/handzeJh">patterns in nature</a>. </p>