VALVATE
Etymology
Adjective
valvate (comparative more valvate, superlative most valvate)
Having or resembling valves (that open and close).
(botany) Meeting at the edges without overlapping.
flowers with valvate petals
Source: Wiktionary
Valv"ate, a. Etym: [L. valvatus having folding doors.]
1. Resembling, or serving as, a valve; consisting of, or opening by,
a valve or valves; valvular.
2. (Bot.)
(a) Meeting at the edges without overlapping; -- said of the sepals
or the petals of flowers in æstivation, and of leaves in vernation.
(b) Opening as if by doors or valves, as most kinds of capsules and
some anthers.
Source: Webster’s Unabridged Dictionary 1913 Edition