Decussate

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1. situation where opposite leaves at any two consecutive nodes on a stem are oriented at 90 degree angles to one another.
2. opposite leaves arranged so that each pair is at right angles to the one below.

cd0238-61.jpeg

cd0238-99.jpeg

Plectranthuscomosus3.jpg

Leaves growing from nodes on a stem at 90 degree angles to each other.
Source: http://www.botgard.ucla.edu/html/MEMBGNewsletter/Volume4number1/d1072tx.html