haplostemonous

from The Collaborative International Dictionary of English v.0.48

Haplostemonous \Hap`lo*stem"o*nous\
   (h[a^]p`l[-o]*st[e^]m"[-o]*n[u^]s), a. [Gr. "aplo`os simple +
   sth`mwn a thread.] (Bot.)
   Having but one series of stamens, and that equal in number to
   the proper number of petals; isostemonous.
   [1913 Webster]