quincuncial

adjective2

1. •
   Arranged in a quincunx.

   • Of this Quincunciall Ordination the Ancients practised much[,] discoursed little; […] — 1658
2. •
   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.