Jones: Fi.oka or Illinois 283 



Trailing. A plant unable to support itself, prostrate but not rooting at the nodes. 

 Tree. A perennial woody plant, usually with an evident trunk, and attaining a height 



at maturity of not less than five meters. 

 Trichome. An outgrowth from the epidermis of plants, as hair, scale, bristle, or 



prickle. 

 Trifid. Divided into three parts; three-cleft. 

 Trigonal. Triangular; the same as trigonous. 

 Tripinnatifid. Thrice pinnatifid. 

 Truncate. Ending abruptly, as if cut off. 



Tuber. Enlarged, fleshy, underground stem, commonly borne at the end of a rhizome. 

 Tubercle. A small swelling, or a little tuber-like body; the persistent base of the 



style in certain Cyperaceae; the grain-like corky growths on the valves of 



Rumex ; enlargements on the roots of leguminous plants produced by symbiotic 



bacteria. 

 Tuberculate. Having tubercles. 



Tubular (corolla). Prolonged into a tube, without much spreading at the border. 

 Twining. Climbing by twisting spirally around another stem or other support. 



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



point, resembling the framework of an inverted umbrella; characteristic of the 



Umbelliferae. 

 Umbellate. Borne in umbels. 



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

 Undulate. With wavy surface or margin. 

 Unisexual. Of one sex, either staminate or pistillate. 

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



at the mouth. 

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



by the persistent caljTC. 



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. 

 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. 



\'lRG.\TE. 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. 

 Zycomorphic. Bilaterally symmetrical; irregular; applied to flowers capable of being 



bisected into similar halves along only one plane. 



