1. In a manner arranged in two rows or ranks; in a distichous pattern (botany: of leaves or other plant parts arranged in two opposite vertical rows along a stem).
Usage: botanical/technical term; derived from the adjective 'distichous'

Examples

• The leaves were arranged distichously along the branch, creating a flat, two-ranked appearance.
• In distichously arranged foliage, each leaf is positioned directly opposite its neighbor on the stem.
• The plant's leaflets grew distichously, making identification easier for botanists.