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adj. Botany Arranged in two vertical rows on opposite sides of an axis: distichous leaves.

adj. Arranged in two rows on each side of an axis

Disposed in two rows; biserial; bifarious; dichotomous; specifically, in botany, arranged alternately in two vertical ranks upon opposite sides of the axis, as the leaves of grasses, elms, etc. Also distich.

"The _leaf-sheaths_ are equal to or longer than the internodes at the base, but shorter above, glabrous, compressed, distichous, bearded towards the mouth and with membranous margins."

distichous antennæ   

multijugate    alternate    opposite    whorled    spiral