cleistogamy

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cleistogamy

the production of small, inconspicuous flowers in which self-fertilization occurs before the flowers open. For example, the violet forms large, showy, cross-pollinating flowers, but also forms cleistogamic flowers late in the summer.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005
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