Tetragonous ; four cornered, or ha- ing four angles. Tetramerous ; consisting of four parts, or constituent portions.
Tetrandro ; having four stamens of equal length. Thorn. A eh •rp proceaa from the woody part of a plant, being a stunted or abortive branch.
Throat. The orifice or passage into the tube of a corolla. Thyrsoid; resembling, or being in the form of a thyrsus. Thyrsus. A kind of contracted, or dense, ovoid panicle, ae in the lilac, horse-chestnut, etc.
Tiller. A sucker, or young shoot of wheat. rye, etc. Tiller, or tit/ow; t put forth auckere, or new shoots. from the root, or base of the stem, as wheat, etc. (See Stole, or Stool.) Tissue. Web, or fabric; the intimate organic structure, or composition of bodies ; especially those which are, or have been, alive.
Tomentoee ; covered with u curled, or matted, cottony pubescence.
Tomesturn. A matted downy or cottony pubescence. Toothed; (See Dentate).
Torose, or torulose ; swelled out fn obtuse ridges. Tortuous; bent in different directions.
Torus. The bed, or receptacle at the apex of a flower stalk, on which are inserted all the parts of the flower. Translucent; clear, or transmitting light faintly. Transverse, transversely; across; crosswise; at right an gles with lengthwise.
Triadelphous; having the filaments united in three par cels.
Triandrous ; having three stamens.
Triangular; having three angles, corners, or points. Tribes. Groupe of kindred plants, intermediate between orders and genera.
Tribra( teate ; having three bracts.
Trichotomous ; three-forked; dividing by three equal branches.
Tricoecous; composed of three separable indehiscent car pels (or cocci).
Tricuspidate ; having, or terminating in, three sharp points.
Trifartous; facing, or pointing, in three directions. Trifld ; three cleft; partially cut or divided into three segmenta.
Trifoliate ; having three leaven; or the leaves arranged in threes.
Trifonulate; three leaflets together.
Trigonous ; three-cornered.
Trigynous ; having three pistils.
Trilobate ; three-lobed.
pounci;_wnicn see.
Umbellate; in the form or manner of an umbel.
Unib• llet A partial umbel; one of the subdivisions of a compound umbel; which see.
Umbelliferous; bearing the flowers in umbels. Umbilicals. Navel like; having a central pit, or depres sion.
Umbonate; protuberant, having a boss or elevated point in the centre.
Unarmed; without thorns or prickles.
U ,cinate. Hock-shaped; hooked at the end.
Undulate. Wavy; curved, or rising and depressed, like waves.
Unequal; the parts not corresponding in length, size, form or duration.
Unguiculate; having a slender or narrow base, like an unguis, ,jr claw.
Uniform, or nniformly. In one form, or manner; equally and alike.
Unilateral. On one aide; growing, or inserted, all on one a aide of astern, or common peduncle.
Unisexual. Of one sex ; i. e. ataminate or pistillate, only. Ureeotate. Pitcher-shaped, or urn-shaped ; swelling below, and contracted to a neck above.
Utricle. A little sac, or thin membranaceous pericarp, which encloaee, but does not adhere to, the seed. (See Caryopsin.) Valvate motivation. When the sepals or petals are folded together, and fit by their edgee, without overlapping. Valves. The several parts of a regularly dehiscent peri carp, especially of a capsule; also the scales which close the rube in some corollas; and the chaffy pieces which cover the flowers of the grasses.
Far (varietat) ; a variety or modification of a species. Variety. A new or unusual form, or modification of a plant. produced by accidental causes, such as crossing, soil, climate, culture, etc., but not permanently, or at least not specifically, distinct.
Vascular plants. The higher orders of plants (including all above the mosses), composed more or lees of woody fibres, and elongated cella or vessels, in the form of slender tubes.
Vaulted; arched over. like the roof of the month.
Veins. The elongated vessels of leaves; often aynonymona nerves.
Veined; having the vessels variously branching over the surface.
Venation of (sled. The distribution of the veins, or frame-work, in the lamina or blade.