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Corolla petals or lobes, number

This refers to the number of petals, lobes or teeth in the corolla, or in the perianth where the calyx and corolla are not clearly differentiated.

FL62 none

No petals or petal-like structures

FL63 of one petal or lobe
FL64 of two petals or lobes FL65 of three petals or lobes
FL66 of four petals or lobes FL67 of five petals or lobes
FL68 of six or more petals or lobes

FL69 fused to form an operculum

Petals fused to one another to form a cap or horn-like structure which is usually shed as a complete unit as the flower matures. This may happen just prior to anthesis or it can occur quite early in the development of the flower.