Spring Flora of Oklahoma 
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Tetramerous—Four-parted. 
Thorn—A highly modified sharp-pointed branch. 
Thorn-like spur—A short stunted branch ending in a sharp point 
or thorn. 
Thyrsus—A dense panicle. 
Tomentose—Covered with dense wool-like hairs. 
Tooth (of peristome)—One of the segments or parts of the peris¬ 
tome of a moss. 
Toothed—Dentate. 
Torus—The upper end of the peduncle which supports the floral 
organs. 
Triadelphous—Having stamens united by their filaments into three 
bundles. 
Trifoliate—A compound leaf with three leaflets. 
Trimerous—Three-parted. 
Truncate—Terminating abruptly by a nearly straight edge or surface. 
Tuber—A thick short geophilous branch or part of a branch. 
Tubercle—A small tuber or a wart-like projection; the persistent 
base of the style in some sedges. 
Tufted—Growing in clusters or clumps. 
Turbinate—Top-shaped. 
Two-ranked—Disposed in two vertical rows along the twig; with 
the third leaf in line with the first. 
Umbel—A determinate inflorescence with all the pedicles arising 
from the same point. 
Umbellate—In an umbel or like an umbel. 
Undulate—With wavy margins. 
Uni-sexual—Having only ovaries or spermaries on one individual. 
Utricle—A one-seeded fruit with a loose pericarp. 
Valvate—Meeting by the margins in the bud, not overlapping; de¬ 
hiscent by valves. 
Valve—One of the parts into which a dehiscent capsule splits. 
Vascular bundle—The conducting strands in the plant body com¬ 
posed of wood and bast in which water and food materials are 
conducted through the roots, stems, and leaves. 
Vein—One of the branches of the vascular portion of leaves or other 
organs. 
Venation—The arrangement of the veins. 
Vernation—The arrangement of the leaves in the bud. 
Versatile—An anther attached at or near its middle to the filament. 
Verticillate—Whorled. 
Villous—With long soft hairs not matted together. 
Viscid—Glutinous ; sticky. 
Whorl—An arrangement of leaves, etc., in a circle round the stem, 
