Webster’s Revised Unabridged Dictionary · 1913
Haplostemonous
Hap′lo·stem′o·nous (hăp′lō·stĕm′ō·nŭs), a. [Gr. ἁπλόος simple + στήμων a thread.] (Bot.) Having but one series of stamens, and that equal in number to the proper number of petals; isostemonous.