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Non-resupinate
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Turned 180° in development; e.g., flowers of most orchids in which the lip originates in the uppermost position but twists in such a way that the labellum faces downward at anthesis. Some orchids do not twist, thus the labellum faces up at anthesis. |
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Nucellus
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The tissue that surrounds the megasporophyte or the embryo sac. It is located between the embryo sac and the integument or integuments. |
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Nuclear endosperm
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Endosperm development in which many nuclei develop before cell walls are formed. |
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Obdiplostemony (obdiplostemonous)
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With two series of stamens with twice the number of stamens as petals and those of the outer series inserted opposite the petals and those of the inner series inserted opposite the sepals. Obdiplostemony is sometimes very difficult to determine in flowers at anthesis but become apparent with microtome and SEM studies of bud development (Endress, 2010). |
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Obturators
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In the Styracaceae, outgrowths of the placental wall that partly cover the ovules. |
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Osmophore
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Tissue or a gland, usually associated with flowers, from which aromas emanate. |
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Ovariodisc
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In the Burseraceae, a single, parenchymatous structure representing the ontogenetic fusion of the nectary disc and the pistillode. |
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Ovary
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The part of the gynoecium (=pistil) containing the ovules. |
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Ovule
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The organ that after fertilization becomes the seed. The ovule in angiosperms contains the embryo sac with an egg cell, several other cell types, and is enclosed within the locule of the ovary. |
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Ovule anatropous
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Referring to a curved downward ovule in such a way that the micropyle is close to the funicular attachment. |
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Ovule campylotropous
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Referring to an ovule in which the axis is at an approximately right angle to its stalk (funicle). |
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Ovule orthotropous
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Referring to a straight ovule in which the micropyle is positioned in a straight line and opposite the funicular attachment; referring to a growth habit in which the growing apex is oriented vertically. |
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Ovules bitegmic
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An ovule with two integuments. |
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Ovules tenuinucellate
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The presence of no cells or a single cell layer between the megasporophyte and the epidermal cells in the early development of the megasporophyte. |
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Palate
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In the Lentibulariaceae and Scrophulariaceae, the space at the throat and limb of the corolla used by pollinating insects as a landing platform. |
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Palea
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The upper of the two bracts that enclose the floret in the Poaceae. Compare with lemma. |
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Papilionaceous corolla
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The zygomorphic corolla of most species of papilionoid legumes. |
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Papilionoid
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Referring to flowers similar to those of Fabaceae subfamily Papilionoideae; e.g., those of the Polygalaceae. |
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Pappus
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A modified calyx of hairs, scales, or bristles typical of many Asteraceae. |
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Parietal placentation
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A type of placentation found in compound, unilocular ovaries in which the ovules arise from placentae inserted on the wall of the locule near the sutures. |
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Pedicel (adj. = pedicellate)
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The stalk supporting some flowers. |
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Perfect flower
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Referring to a flower that possesses both male (staminate) and female (pistillate) organs. |
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Perianth
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The collective term for the calyx and the corolla, even when they are not differentiated (i.e., represented by tepals). |
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Pericarpel
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In the Cactaceae, the part of the receptacle fused to the ovary. |
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Perigon (perigoniate)
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A reduced perianth found in the flowers of some species of Araceae, Monimiaceae, and Siparunaceae. |
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