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Staminal tube
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A floral tube formed by the fusion of androecial tissue, usually the filaments. |
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Staminate flower
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Referring to unisexual flowers with functional stamens but without functional gynoecia (pistillodes may be present). Same as male flower. |
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Staminode
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A sterile stamen, sometimes modified such that it does not resemble a stamen; e.g., Cannaceae; in the Lecythidaceae, a sterile stamen with pollen that does not germinate. |
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Standard
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The upper, broad petal of Fabaceae subfamily Papilionoideae (legumes with pea-like flowers. Standard is prefered over the synonyms banner, flag, and vexillum petal. |
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Stemonozone
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In the Mimosaceae, a tube formed by the adnation of the corolla and filaments. |
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Stenopalynous
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Referring to plant taxa characterized by only slight variation in pollen forms; e.g., Gunneraceae. |
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Stigma
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The part of the gynoecium receptive to pollen usually located at the summit of the style. |
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Stylar collar
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An annular expansion on the style; e.g., in some species of Melastomataceae and Lecythis zabucajo (Lecythidaceae). |
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Style
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The part of the gynoecium between the ovary and the stigma. A style is not always present. |
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Style head
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The expanded distal part of the style, including the stigma, in some species of Apocynaceae. Same as clavuncle. |
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Stylopodium
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An enlargement at the base of the style as in some species of Apiaceae and Lamiaceae. |
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Subsuperior ovary
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A type of inferior ovary in which the sepals, petals, and stamens do not arise clearly from the apex but instead appear to arise from lower down on the ovary. |
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Superior ovary
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An ovary of a hypogynous or perigynous flower in which the sepals, petals, and stamens arise from beneath or around the ovary (= hypogynous) or from the rim of a hypanthium (=perigynous). |
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Symmetric flower
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Same as actinomorphic flower. |
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Sympetalous corolla
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Having petals united for at least part of their length. Same as gamopetalous; opposite of polypetalous and choripetalous. |
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Synandrium (plural = synandria)
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The structure resulting from the cohesion of the anthers of separate male flowers in some Araceae; an androecium with united filaments; e.g., Campanulaceae. |
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Synandroidium (plural = synandroidia)
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A structure formed by the coherence of staminodes of separate flowers in some Araceae. |
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Synandry (synandrous)
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Having united anthers. |
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Syngynesious anthers
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Anthers cohering in a ring; e.g., in the Asteraceae. |
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Synsepalous calyx
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Having sepals united for at least part of their length. Same as gamosepalous. |
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Tenuinucellar
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Referring to a nucellus composed of the epidermis and an embryo sac. Compare with crassinucellar. |
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Tepal
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A uniseriate perianth in which it can not be determined if the segments are sepals or petals, e.g., the segments of the perianth of a tulip. |
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Terminal style
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Referring to a style that arises from the summit of the ovary. |
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Tetrad
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A group of four pollen grains. |
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Tetradynamous
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Having four long stamens and two short stamens; e.g., in Brassicaceae. |
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