368 American Midland Naturalist Monograph No. 7 



Umbel. An indeterminate inflorescence with branches (rays) arising from a 

 common point, resembUng the framework of an inverted umbrella ; char- 

 acteristic of the Umbelliferae. 



Umbellate. Borne in umbels. 



Umbellet. a small umbel formed at the end of one of the rays of a com- 

 pound umbel. 



Uncinate. Hooked at the tip. 



Undulate. With wavy surface or margin. 



Unisexual. Of one sex, either staminate or pistillate. 



Urceolate. Urn-shaped ; ovoid or shortly cylindrical and contracted or con- 

 stricted at the mouth. 



Utricle. A fruit consisting of a single seed enveloped in a thin pericarp and 

 enclosed by the persistent calyx. 



Valve. The pieces into which a capsule splits or divides; of anthers which 



open by flaps or lids; the three inner accrescent sepals of Rumex. 

 Velutinous. Velvety. 



Venation. Arrangement of veins, or vascular bundles. 

 Vernation. The arrangement of leaves in bud. 



Versatile. Attached by the middle so as to swing freely, as an anther. 

 Verticillate. Arranged in a whorl. 



Villous. Provided with long and soft, not matted, hairs; shaggy. 

 ViLLOSULOUS. Minutely villous. 



ViRGATE. Wand-like; with straight, stiff, erect branches. 

 Viscid. Clammy; sticky; glutinous. 



Whorl. An arrangement of three or more leaves or other organs in a circle 

 around the axis. 



Zygomorphic. Bilaterally symmetrical: irregular; applied to flowers capable 

 of being bisected into similar halves along only one plane. 



