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Aapa mires

Overview page. Subjects: Plant Sciences and Forestry — Ecology and Conservation.

Fens, sometimes called ‘string bogs’, of circumpolar distribution, found in northern Scandinavia and boreal Canada. They are soligenous mires with ridges arranged roughly normal to the...

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abacá

Overview page. Subjects: Plant Sciences and Forestry.

(Manila hemp)

The strongest of the hard, natural fibres. It is extracted from the pseudostems of Musa textilis (see MUSA), a relative of the edible bananas. Grown mainly in the...

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abaxial

Overview page. Subjects: Ecology and Conservation — Plant Sciences and Forestry.

Of a plant organ, facing away from the axis or main stem (e.g. the lower surface of leaves). Compare adaxial.

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Abies

Overview page. Subjects: Plant Sciences and Forestry.

(fir; family Pinaceae)

A genus of coniferous trees in which the leaves are crowded on the twigs, often approximately in 2 rows; they are needle-like and single, leaving a round,...

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abscisic acid

Overview page. Subjects: Plant Sciences and Forestry.

A plant hormone synthesized by chloroplasts. High levels of abscisic acid result in the abscission of leaves, flowers, and fruits. The hormone also causes the closing of stomata in response...

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absolute pollen frequency

Overview page. Subjects: Ecology and Conservation — Plant Sciences and Forestry.

(APF)

The expression of pollen data from sediments in terms of the absolute numbers (for each species, genus, or family) per unit area of surface and, where deposition rates are...

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absorption

Overview page. Subjects: Plant Sciences and Forestry — Ecology and Conservation.

The uptake of substances, usually nutrients, water, or light, by cells or tissues.

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abstriction

Overview page. Subjects: Plant Sciences and Forestry.

The detachment and release of a spore by the constriction of the tissue by which it is attached.

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Abutilon

Overview page. Subjects: Plant Sciences and Forestry.

(family Malvaceae)

A genus of trees and shrubs, native to tropical and warm temperate climates, whose members have hairy leaves and branches, and bright, lantern-like flowers,...

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acacia

Overview page. Subjects: Plant Sciences and Forestry.

(family Fabaceae, subfamily Mimosoideae)

A genus of plants, most of which are trees (wattles), although a few are climbers. Typically the leaves are bipinnate, with numerous tiny...

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