Webster's English Dictionary

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cleistogamy

cleis.tog.a.my \kli--'sta:g-*-me-\ n [Gk kleistos closed (fr. kleiein to 
   close) + ISV -gamy - mo]re at CLOSE : the production (as in violets) of 
   small inconspicuous closed self-pollin ating flowers additional to and 
   often more fruitful than the showier type