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Flora Glossary ( A )
 
 
   
Flora Glossary Explanation Picture Source(s)
Abiotic disorders Plant problems caused by non-living agents.
Abscissic acid A plant hormone that triggers leaf or fruit drop.
Abscission Leaf or fruit drop.
Abscission zone Area at the base of the petiole where cellular breakdown leads to leaf drop.
Absorbing roots Fine, fibrous roots that absorb water and minerals; most of them are within the top 30 cm of soil.
Absorption The uptake of substances.
Acclimation Process by which plants and other living organisms adapt physiologically to a climate or environment different than their own.
Acerose Needle-shaped.
Aculeolate Minutely prickly; covered with tiny prickle
Acuminate Describing a leaf that gradually narrows to a sharp point. http://www.thefreedictionary.com/acuminate
Acuminate Leaf shape having an apex the sides of which are gradually concave and taper to a point.
Acute Suddenly or over a short period of time; used here to refer to disorders or diseases.
Adaptability Genetic ability of plants and other living organisms to adjust or accommodate to different environments.
Adventitious bud Bud that arises from a place other than a leaf axil.
Aeration Provisions of air to the soil to alleviate compaction and improve its structure.
Aerial roots Roots occurring above ground or water.
Afforestation The planting of trees on land that are not forests.
Air-layering A propagation method whereby you remove a part of a plant to create another plant.
Allelopathy The release of a chemical substance by an organism that acts as a germination or growth inhibitor to another organisms.
Alluvial Applied to the environments, actions and products of rivers or streams.
Alternate Having leaves situated one at each node and alternating positions on the stem; this arrangement means that the leaves are not across from each other.
Alveolar See alveolate
Alveolate Honey-combed, with pits seperated by thin, ridged partitions
Anatomy Study of the structure and composition of an organism.
Angiosperm A flowering plant producing seeds that are enclosed fully by fruits; consisting of two big groups monocotyledons and dicotyledons.
Anther The part of the flower that contains the pollen.
Anthocyanins Red, purple, or blue pigments; responsible for those colours in some parts of trees and other plants.
Antigibberellin Plant growth regulator that inhibits the action of the plant hormone gibberellin.
Antitranspirant Substance sprayed on plants to reduce transpiration.
Aperturate With one or more openings or apertures. In pollen grains, these apertures maybe only thin spots rather than actual perforations
Apex The tip of a leaf, shoot or root.
Apical Pertaining to the tip.
Apical bud Terminal bud on a stem.
Apical dominance Condition in which the terminal bud inhibits the growth and development of lateral buds on the same stem.
Apical meristem The growing point at the tip of the root or stem.
Arachnoid Bearing long, cobwebby, entangled hairs
Arboriculture The study of tree care.
Argenteous Silvery
Arils A usually fleshy and often brightly coloured outgrowth from a seed.
Armed Bearing thorns, spines, barbs, or prickles
Asperous Rough to the touch
Attenuate Leaf shape tapering gradually to a narrow base
Autotroph An organism that is able to manufacture its own food.
Auxin Plant hormone or substance that promotes or regulates the longitudinal growth and development of plants; it is produced at sites where cells are dividing, primarily in the shoot tips.
Axil The upper angle where the leaf stalk joins the stem or where a small stem joins a larger one.
Axillary Occurring within the axil.
Axillary bud Bud in the axil of a leaf.
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