the world > plants > part of plant > (defined by) distribution, arrangement, or position > [adjective] > one-sided, directed, or leaning to one side (5)
Arranged on or directed towards one side only; esp. Botany of the flowers, leaves, or other organs of a plant.
Having the constituent parts or principal features on one side.
Inclined downwards or leaning to one side.
Botany and Zoology. Arranged or produced on one side of an axis or surface; directed or turned towards one side.