Glossary of Terms

ABSCISSION LAYER
Cork layer at base of leaf stalk of Deciduous trees in autumn causing
leaf to fall.
CALLUS
Swelling usually surrounding diseased or damaged tissue on a branch or trunk.
DECUSSATE
Leaves in pairs on opposite sides of stem, but each pair at right angles to the next.
ACHENE
Small,dry,Indehiscent fruit with a single seed. Its thin wall
distinguishes it from a Nutlet
CAMBIUM
Layer of living just under bark and at growing tips of shoots and roots.
DENTATE
Margin with sharp teeth.
ALIEN
An introduced plant which has become Naturalised.
CATKIN
Male or female, wind pollinated flowers hanging in chains
DIGITATE
Leaflets spreading like the fingers of a hand.
ALTERNATE
An arrangement of leaves on a stem, each Node bears on a leaf on
alternate sides of the Stem.
COLUMNAR
Narrow, almost parallel-sided crown.
DIOECIOUS
Separate male and female flowers borne on different plants.
ANNUAL
A plant completing its life cycle within a single year.
COMPOUND
Leaf made up of several distinct leaflets.
DORSEL
Back or outer surface of an organ
ANNUAL RING
Ring of wood laid down in stems and branches  during one growing season.
CONE AXIS
Central core of cone.
DOUBLE-TOOTHED
Margin with large teeth, each of which as smaller teeth.
ANTHER
Part of a stamen that releases
pollen.
CONE SCALE
Woody structure rising from cone axis, enclosing developing seeds.
DRUPE
Fleshy fruit with the seed[s] surrounded by a stony layer.
ARIL
Fleshy seed coat.
CONIFEROUS
Cone bearing tree.
ELLIPSOID
Solid body, widest at the middle.
AURICLE
Small, ear-like lobe.
COPPICING
Cut down regularly to the base to encourage growth of several stems from one root system.
ELLIPTIC
Outline, widest at the middle, rounded and narrowed towards each end.
AWN
A stiff terminal bristle, on a fruit or the Lemma in grasses.
CORDATE
Heart shaped.
ENDEMIC
Native to a restricted region, usually a single country or small area.
AXIL
The place between a stem, twig , or leaf and the main stem
COTYLEDON
The seed leaf, first to emerge from the seed.
ENTIRE
Margin unbroken by teeth or lobes.
BARK
Protective layer on the outside of stems and branches.
CROWN
Branches and upper part of trunk of tree.
EVERGREEN
Tree or shrub which retains its leaves all year.
BRACT SCALE
Thin, papery, seed bearing structure rising from cone axis above cone
scales
CRENATE
Margin with shallow, rounded teeth.
FAMILY
Large group of similar plants, made up of several genus.
BRANCHLET
Small branch, between branch and twig in size.
CUTICLE
Waxy surface of a leaf, reducing water loss and protecting against damage.
FASTIGATE
Tree with nearly vertical branches.
BUD
Developing shoot or flower
CUTTING
Non-reproductive part of a plant, stimulated artificially to form an identical new
individual.
FERTILISATION
Union of a male pollen grain with a female ovule to form the embryo of a
new individual.
BUD SCALE
Scale that covers and protects a developing bud.
DECIDUOUS
Trees which drops its leaves in autumn.
FLUTED
With deep vertical grooves.
BURR
Lumpy outgrowth from a trunk, often covered with sprouting shoots.
DECURRENT
The base continued down the stem as a wing.
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