Category: P
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Pollen grain
Multicellular structure containing a single set of chromosomes that produces the male sperm cells of seed plants. The germinated, usually two-celled, microspore of seed plants.
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Pollard
Cutting of tree trunks or branches at regular intervals to harvest, dwarf or shape the tree.
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Polar view
(In pollen) a grain viewed with the polar axis facing the observer, i.e. at right angles to the equator.
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Polar
Relating to the poles, or top and bottom ends, of a ± round organ. A characteristic of a molecule possessing a positive or negative charge.
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Poikilohydrous
With its water content determined by the surrounding atmosphere, becoming dormant in the dry season after losing most of its water, rehydrating when water becomes available again. Becoming desiccated during dormancy in the dry season but capable of rehydration when water becomes available again.
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Podocarp
A stem or stalk bearing the fruit [unusual term].
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Podium
Small stalk or similar support [unusual term].
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Podarium
(In cacti or other succulents) a modified leaf base functioning as the photosynthesising organ.
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Pod
A general term for a dry dehiscent fruit with a firm outer layer enclosing a hollow centre with one or more seeds; A legume formed of a single carpel; A siliqua, two-celled and divided by a thin partition. Any kind of dry, dehiscent fruit. A dry dehiscent fruit containing many seeds. Any dry dehiscent seed…
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Pneumatophore
Erect (breathing) root protruding above the soil, encountered especially in mangroves.