Quin‐cun″cial (?), [L. quincuncialis, from quincunx. See Quincunx.]
1. Having the form of a quincunx.
2. (Bot.) Having the leaves of a pentamerous calyx or corolla so imbricated that two are exterior, two are interior, and the other has one edge exterior and one interior; as, quincuncial æstivation.
Quincuncial phyllotaxy(Bot.), an arrangement of five leaves in a spiral, each leaf two fifths of a circle from the next.