Umbraculiform
Umbraculiform (um*brak"u*li*fôrm) , adjective
[Latin umbraculum any thing that furnishes shade, a bower, umbrella (dim. of umbra a shade) + -form.]
(Botany) Having the form of anything that serves to shade, as a tree top, an umbrella, and the like; specifically (Botany), having the form of an umbrella; umbrella-shaped.