Corrugate

Corrugated [ Botany ] Synonym: Crumpled	Dictionary of botanic terminology - index of names
Adjective: Corrugate or corrugated Noun: Corrugation Transitive and intransitive verb: [ past and past participle corrugated, present participle corrugating, 3rd person present singular corrugates ]

Shaped into wrinkles or folds, or alternate ridges and grooves.

Used in botany to describe the shape or appearance of some surfaces and thin laminar structures irregularly folded in all directions, wrinkled (e.g. petals, leaf lamina, etc..)
Also describe the loose wrinkles along a margin, not flat, but on a smaller idea than undulated would imply.

For example imbricate petals are described as crumpled (corrugate) when puckered irregularly in the bud.

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