Hap`lo·stem'o·nous (hăp`lo*stĕm'o*nŭs) adjective [ Greek 'aplo`os simple + sth`mwn a thread.] (Botany) Having but one series of stamens, and that equal in number to the proper number of petals; isostemonous. Found on http://www.encyclo.co.uk/webster/H/12