| Peloric |
A term used to describe an unusual condition where all three petals (instead of just one) have developed to mimic the labellum in shape and/or color.
Coined by Darwin to describe a mutant flower that has many planes of reflectional symmetry.
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Last Updated: 06-28-2006 @ 10:46 AM Submitted By: Oscarman
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| Perianth |
(PEAR-ee-anth)
The sterile parts of a flower; collectively, the sepals and petals |
Last Updated: 07-06-2010 @ 12:52 AM Submitted By: Oscarman
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| Petal |
| The whorl of flower parts just inside the sepals, usually colorful. The median petal of orchids, the labellum, is often differentiated in form and/or function. |
Last Updated: 05-20-2013 @ 02:26 PM Submitted By: Oscarman
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| Photoperiod |
(pho-toe-peer-i-od)
The duration of an organism's daily exposure to light, considered especially with regard to the effect of the exposure on growth and development. |
Last Updated: 05-20-2013 @ 02:13 PM Submitted By: Oscarman
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| Photosynthesis |
| The process in green plants and certain other organisms by which carbohydrates are synthesized from carbon dioxide and water using light as an energy source. Most forms of photosynthesis release oxygen as a byproduct. |
Last Updated: 04-27-2006 @ 11:09 PM Submitted By: Oscarman
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| Phototropism |
| Phototropism is a growth movement induced by a light stimulus. Growth towards a source of light is called positive phototropism, that away from the source is termed negative phototropism. The tips of shoots are usually positively, that of roots negatively phototropic. |
Last Updated: 07-20-2006 @ 10:47 PM Submitted By: Oscarman
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| Pilose |
| Covered with hair, especially soft fine hair; furry. |
Last Updated: 01-31-2013 @ 01:52 AM Submitted By: Oscarman
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| Pod |
See Capsule.
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Last Updated: 05-08-2006 @ 11:48 PM Submitted By: Oscarman
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| Pollinarium |
| A functional unit in orchid pollination, consisting of two or more pollinia, stalk or stipe, and viscidium. |
Last Updated: 04-27-2006 @ 11:10 PM Submitted By: Oscarman
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| Pollinium |
(pol-LIN-ee-um)
pl. pollinia
A compact mass of pollen grains. Often yellow, distinct, and found under the anther cap of the column. |
Last Updated: 04-27-2006 @ 11:11 PM Submitted By: Oscarman
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| Polyploidy |
| The state where all cells have multiple pairs of chromosomes beyond the basic set. |
Last Updated: 04-27-2006 @ 11:11 PM Submitted By: Oscarman
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| Primary Hybrid |
| The progeny which result from a cross between two species. |
Last Updated: 08-01-2006 @ 09:35 PM Submitted By: Oscarman
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| Proliferation |
| A tendency for protocorms to grow into a mass of relatively unorganized plant tissue rather than develop into individual plantlets. |
Last Updated: 04-27-2006 @ 11:12 PM Submitted By: Oscarman
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| Protocorm |
| A swollen tuber-like structure that is the first stage of growth after an orchid seed germinates. |
Last Updated: 04-27-2006 @ 11:12 PM Submitted By: Oscarman
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| Pseudobulb |
(SOO-doh-buhlb) - a false bulb.
Thickened or bulb-like stems produced by some sympodial orchids to store water and food. Most often topped with one or two leaves. Characteristic of orchids whose habitat has seasonal periods of dryness or drought.
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Last Updated: 05-08-2006 @ 11:49 PM Submitted By: Oscarman
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| Pubescent |
| Covered with fine hairs. |
Last Updated: 04-27-2006 @ 11:13 PM Submitted By: Oscarman
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| Quadrigeneric |
| Pertaining to four genera, primarily used to describe hybrids which contain genetic material from four different genera. |
Last Updated: 04-27-2006 @ 11:14 PM Submitted By: Oscarman
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| Raceme |
| An unbranched, elongated inflorescence with stalked flowers, as in Cymbidium, Cattleya, Odontoglossum, etc. In a raceme, the oldest flowers are borne towards the base and new flowers are produced as the shoot grows. |
Last Updated: 01-26-2008 @ 04:55 PM Submitted By: Oscarman
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| Reflasking |
(re-FLASS-king)
Transplanting small seedlings into flasks of fresh medium to permit greater growth before establishing the seedlings into community pots or thumb pots. |
Last Updated: 10-12-2008 @ 01:35 AM Submitted By: Oscarman
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| Respiration |
(res-pi-RAY-shun)
The gaseous diffusion and interchange bewteen the plant cells and the atmosphere in which the plant absorbs oxygen and gives of carbon dioxide. This process occurs in darkness as well as in the light, and in all plant cells whether they contain chlorophyll or not. |
Last Updated: 10-12-2008 @ 02:00 AM Submitted By: Oscarman
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