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Diplostemony (diplostemonous)
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With two series of stamens; those of the outer series inserted opposite the sepals, those of the inner series inserted opposite the petals. Compare with obdiplostemonous. Diplostemony is sometimes very difficult to determine in flowers at anthesis but becomes apparent with microtome and SEM studies of bud development of obdiplostemony which is also applicable to diplostemony (Endress, 2010). |
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Disc
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A fleshy, lobed, or annular nectariferous structure found within flowers; the position can be either outside or within the stamens. Preffered spelling is disc. Not to be confused with disk flower in the Asteraceae. |
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Disciform capitulum (head)
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An inflorescence of Asteraceae with only disk flowers. |
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Discoid capitulum (head)
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Inflorescence of Asteraceae with only disk flowers. Same as disciform capitulum. |
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Discolor (adj. = dicolorous)
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When two sides of an organ, such as a leaf blade, are different colors. |
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Discolor (adj. = discolorous)
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When two sides of an organ, such as a leaf blade, are different colors. |
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Discolor (adj. = discolorous)
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When two sides of an organ, such as a leaf blade, are different colors. |
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Disk flower
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An actinomorphic flower with a tubular corolla found in Asteraceae. Compare with ray flower. |
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Dispersal (disperse)
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The transport of fruits, parts of fruits, or seeds away from a parent plant by agents such as water, wind, bats, other mammals, ants, scarab beetles, etc. The act of dispersing a diasporte. |
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Distal
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Remote from the place of attachment. Opposite of proximal. Same as apical. |
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Distal
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The part of an organ furthest away from the point of attachment. |
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Distichous
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Referring to structures that are arranged in two rows; usually referring to the way in which leaves or bracts are inserted on an axis. Same as two-ranked. |
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Distyly (distylous)
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A type of heterostyly in which flowers with both long and short styles occur in different individuals of the same species. |
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Diurnal
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Appearing during the day, such as a flower at anthesis. |
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Diurnal
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Appearing during the day, such as a flower at anthesis. |
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Divergent
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Referring to an organ, such as a flower or the thecae of an anther, that spreads away from the axis to which it is attached. |
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Domatium (pl. domatia)
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A cavity or chamber, mostly associated with leaves, that usually serves as home for ants or mites. |
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Domatium (plural = domatia)
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Referring to axillary cavities, enclosed chambers, hollow stems, hollow petioles, modified stipules, or clusters of trichomes that harbor ants, mites, and other invetebrates. All of these structures are called domatia. |
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Double calyx
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A calyx with two apparent whorls; e.g., the calyx of Amphilophium painculatum. |
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Drip tip
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A long, tapered leaf blade apex that is thought to help water drain form the blades thereby reducing the number of epiphylls that become established on the leaf. |
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Drupe
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A single-seeded, indehiscent fruit with three distinct layers: the thin excocarp, often fleshy mesocarp, and the often woody or bony endocarp. |
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Drying frames
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Referring to wood or metal frames upon which a plant press is placed. The heat source can be propane gas, light bulbs, heating strips, or hot plates. The opening in the top of the frame should be covered by a wire mesh to make sure that nothing falls onto the heat source and catches fire. The size of the frame depends upon the number of specimens collected each day and the distance from the plant press to the heat source is determined by the intensity of the heat source. For more information about plant collecting see Tropical Plant Collecting: From the Filed to the Internet. This book can be purchased at: http://tecceditora.com/ or Amazon.com. |
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Duplicate collection
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Referring to a collection number that is represented by more than one specimen. For example, a collector working out of a host herbarium should collect at least three collections of plants they are not able to identify 1) the first stays at the host herbarium, 2) the second is sent to a specialist, and 3) the third is archived in the herbarium of the collector. Two duplicates can be made if the collector is able to identify the collection to species and more are usually made if the collection is of special interest. For more information about plant collecting see Tropical Plant Collecting: From the Filed to the Internet. This book can be purchased at: http://tecceditora.com/ or Amazon.com. |
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Dysozoochorous
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A type of secondary seed dispersal in which some of the diaspores are carried away and intentionally buried or stored (cached) by scatter-hording animals such as agoutis (Dasyprocta spp.) while the other diaspores are eaten and digested, e.g., the dispersal of Brazil nut seeds by agoutis. Same as scatter-hoarding. |
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Ecology
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Dome-like granitic outcrops common on the Guayanan Shield of northeastern South america. Inselbergs are sparsely covered by vegetation which often occurs as clumps here-and-there and separated by bare rocks. Low gnarled trees of species of Clusia are often dominant in this vegetation type. Most inselbergs occur below 1000 meters altitude. |
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