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Pterophyll
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Expanded sepal (usually white or green) of some Rubiaceae that usually are expanded fully after anthesis and aid in wind dispersal. |
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Rachilla
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The axis of a spikelet of a Cyperaceae or a Poaceae along which are placed the florets. |
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Radially symmetrical flower
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A flower, capable of being divided, by more than one line passing through the middle of the flower, into two equal parts that are mirror images of one another; e.g., in Gustavia (Lecythidaceae), species of Myrtaceae, and species of Rubiaceae. Same as actinomorphic, polysymmetric, and regular flowers and opposite of zygomorphic, monosymmetric, bilateral, and irregular flowers. This term can refer to other plant parts as well. |
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Radially symmetrical pollen
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In the Malpighiaceae, referring to pollen with pores on the equator and colpi, if present, oriented at right angles to the equator. |
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Ray flower
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A zygomorphic flower with a straplike corolla found in Asteraceae. Compare with disk flower. |
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Receptacle
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The more or less expanded apex of the axis beyond the pedicel upon which the floral parts are borne. |
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Receptacular throat
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In the Cactaceae, the part of the receptacle above the receptacular tube. |
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Receptacular tube
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In the Cactaceae, the broadened part of the receptacle between the summit of the ovary and the point at which the receptacle begins to broaden. Same as epigynous hypanthium. |
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Recepticle
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The thickened part of the pedicel from which the flower organs or the 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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Regular flower
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A flower, capable of being divided, by more than one line passing through the middle of the flower, into two equal parts that are mirror images of one another; e.g., in Gustavia (Lecythidaceae), species of Myrtaceae, and species of Rubiaceae. Same as actinomorphic, polysymmetric, and radially symmetrical flowers and opposite of zygomorphic, monosymmetric, bilateral, and irregular flowers. This term can refer to other plant parts as well. |
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Resupinate
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Turned 180° in development; e.g., flowers of the Orchidaceae in which the lip originates in the uppermost position but twists 180° so it facing downward at anthesis. Most orchids have resupinate flowers. |
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Rostellum (plural = rostella)
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The portion of the stigma of some Orchidaceae that separates the anther from the fertile part of the stigma and aids in gluing the pollinia to the pollinators; a small beak. |
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Rotate
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Disk-shaped or flat and circular, usually referring to a sympetalous corolla with a short tube and very widely spreading lobes. |
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Salverform
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Referring to the shape of a sympetalous corolla in which the tube is slender and the lobes are abruptly spreading and flat. Same as hypocrateriform and more frequenly used by authors than that term. |
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Sectile
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Referring to the aggregate clumps of soft, granular pollen which distinguishes some species of Orchidaceae. In these species the pollen is easily separated and not aggregated in distinct pollinia. |
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Sectile pollen
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Referring to the aggregate clumps of soft, granular pollen which distinguishes some species of Orchidaceae. In these species the pollen is easily separated and not aggregated in distinct pollinia. |
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Sepal (sepals)
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A segment of the calyx. |
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Septal nectary
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A nectary developing in the septal regions of the ovary. |
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Septal region
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The part or parts of the ovary associated with the septa. |
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Simple pistil
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A gynoecium composed of a single carpel. |
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Simple style
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Referring to a style that is not divided at the apex. |
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Spathella
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Saclike covering of the young flowers of Podostemaceae. |
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Spur
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A tubular, usually nectar-producing outgrowth of a part of a flower; e.g., part of the sepal in some Vochysiaceae. |
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Stamen
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The male part of the flower comprised of the filament and the anther; in the Lecythidaceae stamens are found attached to the staminal tube in those genera that have one (Allantoma, Cariniana, Grias, and Gustavia) and, as far is known, to the staminal ring of species with zygomorphic flowers. Stamens associated with the ligule are hypothesized to be staminodes bearing antherodes and not anthers. |
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Stamens
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The male part of the flower comprised of the filament and the anther. |
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