(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 aestivation.
Quincuncial phyllotaxy (Bot.), an arrangement of five leaves in a spiral, each leaf two fifths of a circle from the next.
... a funeral psalm wafted on a November wind! and the gayest thing you shall meet with shall be a silver nail or gilt "Anno Domini" from a perished coffin top. The very same remark applies in the same force to the interesting, though the far less interesting, Treatise on the Quincuncial Plantations of the Ancients. There is the same attention to oddities, to the remotenesses and "minutiae" of vegetable terms,—the same entireness of subject. You have quincunxes in heaven above, quincunxes in earth below, and quincunxes in ... — Biographia Epistolaris, Volume 1. • Coleridge, ed. Turnbull
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