The Collaborative International Dictionary
Monopetalous
Monopetalous \Mon`o*pet"al*ous\, a. [Mono- + petal: cf. F. monop['e]tale.] (Bot.) Having only one petal, or the corolla in one piece, or composed of petals cohering so as to form a tube or bowl; gamopetalous.
Note: The most recent authors restrict this form to flowers having a solitary petal, as in species of Amorpha, and use gamopetalous for a corolla of several petals combined into one piece. See Illust. of Gamopetalous.