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Pollen guide
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Markings on a flower that apparently serve to guide pollinators to pollen which is the reward they receive for visiting the flower. Some pollen guides are visible to humans, but others are apparent to humans only through ultraviolet photography. |
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Pollen syntricolpate
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A type of pollen in which the colpi unite at both poles of a pollen grain. |
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Pollen syntricolpate
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A type of pollen in which the colpi unite at both poles of a pollen grain. |
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Pollinarium (plural = pollinaria)
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The pollen-bearing structure of Orchidaceae composed of a viscidium, a stipe, and pollinia. |
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Pollination (pollinate}
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The transfer of pollen from an anther in a flower to the stigma of the same or to a different flower of the same species by pollinators such as the wind, water, insects, and mammals. Pollinate is the act of pollination. |
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Pollinator
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An agent, such as the wind, water, some insects, and some mammals, that moves pollen from an anther in a flower to the stigma of the same flower or to the stigma of a different flower of the same species. |
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Pollinator guide
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Markings on a flower that apparently serve to guide pollinators to pollinator rewards, generally pollen or nectar. Some are visible to humans, but others are apparent to humans only through ultraviolet photography. Same as pollen guide or nectar guide. |
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Pollinator reward
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A general term that refers to a reward that an animal pollinator gets when it visits a flower. The reward is usually pollen or nectar. |
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Pollinium (plural = pollinia)
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An aggregate pollen mass characteristic of Orchidaceae and those of Apocynaceae subfamily Asclepiadoideae. |
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Polyandrous
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Referring to an androecium with numerous stamens. Same as polystemonous. |
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Polycarpy (polycarpic or (polycarpous)
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Referring to plants that flower repeatedly; i.e., those that do not die after a single flowering. Same as iteroparous and pleionanthic; opposite of monocarpic, hapaxanthic and semelparic. |
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Polygamodioecy (polygamodioecious)
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Referring to the sexual condition of a species that bears (male) staminate and bisexual (perfect) flowers on some plants and female (pistillate) and bisexual flowers on other plants. |
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Polygamomonoecy (polygamomonoecious)
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Referring to the sexual condition of a species that bears staminate, pistillate, and bisexual flowers on the same plant. Same as trimonoecious. |
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Polygamous
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Referring to the sexual condition of a species that bears bisexual and unisexual flowers on the same plant, e.g., an andromonoecious plant (with male [staminate] and female [pistillate] species is one example of a polygamous species. |
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Polypetalous corolla
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Having petals free from one another. Same as choripetalous; opposite of sympetalous. |
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Polyphyletic
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The inclusion of more than one evolutionary line in a taxonomic group. |
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Polyploidy
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Referring to a process in which more than two sets of chromosome numbers are present. This is often the result of hybridization. |
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Polystemonous
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Having many stamens. Same as polyandrous. |
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Polysymmetric 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 acinomorphic, radially symmetrical, 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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Pome
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An indehiscent fleshy fruit consisting of seeds surrounded by the pericarp which is in turn are surrounded by fleshy tissue derived from the hypanthium. This fruit type is found in species of Rosaceae subfam. Maloideae. Because part of the fruit is derived from the hypanthium, i.e. both the ovary and the hypanthium are part of the fruit, a pome is also considered to be a type of accessory fruit. |
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Poricidal anther dehiscence
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Referring to anthers that shed their pollen via terminal apertures; e.g., Gustavia spp. (Lecythidaceae) and Solanum spp. (Solanaceae). |
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Poricidal capsule
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A capsule that opens via apical pores, e.g., species of the genus Papaver. |
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Poricidal dehiscence
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Opening via pores; usually applied to anthers that shed their pollen via terminal apertures, e.g., Gustavia spp. (Lecythidaceae) and Solanum spp. (Solanaceae) or to capsular fruits (e.g., species of Papaver). |
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Posterior end of flower
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In neotropical Lecythidaceae, the side of the flower from which the ligule arises. |
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Posterior hood extension
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An extension from the androecial hood split that gives rise to staminodes and/or vestigial stamens that are swept inward. |
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