adjective Botany.
pertaining to or having pollination occurring in unopened flowers.
Also, cleistogamic [klahy-stuh-gam-ik] .
Compare chasmogamous.

1880–85; cleisto- + -gamous

cleistogamously, cleistogamically, adverb
cleistogamy, noun
noncleistogamic, adjective
noncleistogamous, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
cleistogamy (klaɪˈstɒɡəmɪ)
Compare chasmogamy self-pollination and fertilization of an unopened flower, as in the flowers of the violet produced in summer

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
cleistogamous   (klī-stŏg'ə-məs)  Pronunciation Key 
Of or relating to a flower that does not open and is self-pollinated in the bud. The fertile flowers of the violet are inconspicuous and cleistogamous, while the plant's more familiar showy flowers are usually infertile.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Cleistogamous seed develops within the leaf sheaths at the bases of plants in early summer and matures by late summer.
Fertile cleistogamous flowers often produced after the normal ones on short, prostrate to erect peduncles.
Downy brome is cleistogamous and self-fertile, with no evident out-crossing.
It is cleistogamous and selffertile, with no evident outcrossing.
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