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Theca (plural = thecae)
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The chamber of an anther in which the pollen is produced. |
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Torus
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The thickened part of a pedicel from which the flowers or fruits arise. In some accessory fruits, for example the pome and strawberry, the receptacle gives rise to the edible part of the fruit. |
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Translator (=translator arm)
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In the Apocynaceae subfamily Asclepiadoideae and Orchidaceae, the structure connecting the pollinia to the gland. Same as caudicle. |
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Triad
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In palms, a group (structurally a short cincinnus) of two lateral staminate flowers and a central pistillate flower. |
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Tricolpate
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Referring to a pollen grain with three colpi. |
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Tricolporate
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Referring to a pollen grain with three pores situated within three colpi. |
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Trilocular
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With three locules; e.g., an ovary. |
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Trinucleate pollen
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Referring to pollen grains that have three nuclei when shed from the anthers. Compare with binucleate pollen. |
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Tube
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A chamber formed by the fusion of separate parts; e.g., the corolla tube or the tube of the spathe in Araceae. |
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Tubercle
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The modified and persistent style base of some Cyperaceae. |
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Unilocular
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Referring to an ovary with a single locule. |
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Uniseriate perianth
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Referring to a perianth with a single whorl composed of either the calyx or the corolla; e.g., the perianth of Nyctaginaceae and Thymelaeaceae. |
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Unisexual flower
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Referring to a flower with either functional stamens or functional gynoecia but not both. Same as imperfect flower. |
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Unitegmic ovule
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An ovule with one integument. |
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Urticaceous stamens
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Stamens that spring forward to release pollen at anthesis; typical of the flowers of the Urticaceae and some related families. |
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Versatile anther
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A stamen in which the filament is attached to the anther above the base of the anther. |
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Vestigial stamen
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An appendage derived directly from a staminode and indirectly from a stamen that no longer has an anther or the anther is small and withered compared to the fertile anthers of normal stamens in the staminal ring or the fodder pollen-producing anthers of staminodes. |
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Vestigial stamens external
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Referring to an inwardly curved hood that possesses vestigial stamens only on the outside of the coil; e.g., in the Lecythidaceae. |
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Vexillum
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The upper, broad petal of Fabaceae. Same as standard, flag, and banner with standard the preferred term. |
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Viscidium
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In the Orchidaceae, a sticky part of the rostellum that is removed with the pollinia as a unit and serves to attach the pollinia to the dispersal agent. |
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Zygomorphic flower
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A flower capable of being divided into only two equal parts (mirror images) by a line passing through the middle of a flower, i.e., other lines passing the middle of the flower will not give mirror images of one another; same as monosymmetric, bilaterally symmetrical, and irregular flowers and opposite of actinomorphic, monosymmetric, radially symmetrical, and regular flowers. This term can refer to other plant parts as well. |
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