QUINCUNCIAL
Etymology
Adjective
quincuncial (comparative more quincuncial, superlative most quincuncial)
Arranged in a quincunx.
(botany) 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.
Source: Wiktionary
Quin*cun"cial, Etym: [L. quincuncialis, from quincunx. See Quincunx.]
1. Having the form of a quincunx.
2. (Bot.)
Definition: 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.
Source: Webster’s Unabridged Dictionary 1913 Edition