The Collaborative International Dictionary of English v.0.48:
Umbellar \Um"bel*lar\, a. (Bot.) Of or pertaining to an umbel; having the form of an umbel. [1913 Webster] UmbellateWordNet (r) 3.0 (2006):
umbellar adj 1: bearing or consisting of or resembling umbels [syn: umbellate, umbellar]