Decussatus
/deh-kus-SAH-tus/🏷️ Taxonomy●●● Advanced
Also known as: decussata, decussatum
A morphological epithet describing the arrangement of leaves, branches, or other organs in opposite pairs where each pair is set at 90° to the pair above and below — creating a cross-like pattern when viewed from above. Appears as decussatus (masculine), decussata (feminine), or decussatum (neuter).
Etymology
From Latin decussatus, past participle of decussare (to cross), from decussis (the Roman numeral X, a cross), from decem (ten) + as (unit).
Example
“Callitris decussata and Cupressus sempervirens both have the characteristic decussate, alternating-right-angle branching that gives conifers their precise, cross-patterned spray arrangement.”