FLORA OF THE DISTRICT OF COLUMBIA. 305 



Subcordate. Shallowly two-lobed, referring to the base. 



Subcoriaceous. Somewhat leathery in texture. 



Subulate. Awl-shaped. 



Succulent. Juicy, fleshy. 



Suffrutescent. Slightly shrubby. 



Sulcate. Grooved or furrowed lengthwise. 



Superior. Situated above another organ; more particularly referring to an ovary 



which is free from the calyx. 

 Suture. A line of splitting or dehiscence. 

 Symmetrical. Referring to flowers which have the same number of members in each 



whorl. 

 Tendril. A slender, leafless, spirally coiled organ of attachment developing from 



modified stems or leaves. 

 Terete. Circular in cross section; cylindric or nearly so. 

 Ternate. Arranged in threes. 

 Thorn. A stout spine. 

 Throat. The orifice of a gamopetalous corolla or calyx; the orifice of any tubular 



organ, as of a sheath in grasses. 

 Thyrse. A contracted, cylindrical or ovoid and usually compact panicle. 

 Thyrsoid. Resembling a thyrse. 



Tomentose. With a dense woollike covering of closely entangled, matted hairs. 

 Tomentulose. Sparingly or minutely tomentose. 

 Tomentum. A close matted covering of entangled woollike hairs. 

 Toothed. Furnished with marginal teeth of various form; more exactly, dentate. 

 Trifoliolate. Having three leaflets. 



Triquetrous. Sharply three-angled, the Bides concave or channeled. 

 Truncate. Terminating abruptly, as if cut off crosswise. 

 Tuber. A short thickened underground branch having numerous buds. 

 Tubercle. A small tuber or tuber-like body; a small wartlike excrescence; the per- 

 sistent base of the style in certain Cyperaceae. 

 Tuberculate. With small wart-like projections. 



Tuberous. Tuber-like in appearance; having the characteristics of a tuber. 

 Turbinate. Inversely conical; top-shaped. 

 Turgid. Thick, as if swollen by sap. 

 Umbel. An indeterminate inflorescence in which the peduncles or the pedicels of a 



cluster arise from a common point, the outer flowers blooming earliest. 

 Umbellate. Borne in umbels; umbel-like. 

 Uncinate. Hooked; resembling a hook. 



Undulate. With wavy surfaces, especially toward the margins; repand. 

 Unguiculate. Having a contracted clawlike base. 



Unisexual. Referring to flowers wholly of one sex, either staminate or pistillate. 

 Urceolate. Hollow and urn-shaped, constricted near the mouth. 

 Utricle. A small bladdery one-seeded fruit; any small inflated body. 

 Valvate. Meeting by the margins in the bud, without overlapping; opening by 



valves, as a capsule. 

 Valve. One of the segments into which a capsule splits. 

 Vascular. Provided with vessels or conducting tissue. 

 Veinlet. A branch of a vein. 



Veins. The smaller branches of vascular tissue forming the framework of the leaf . 

 Venation. The arrangement of the veins. 

 Ventricose. Swelling unequally; inflated on one side. 

 Vernation. The arrangement of leaves or leaf parts in the bud. 



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