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Featured Trees

Tree Location

Additional Feature Photos

Dawn Redwood

Kentucky Coffeetree

Ornamental Pear

Blue Beech

Northern Catalpa


American Yellowwood

River Birch

Red Pine


Japanese Tree Lilac

Quaking Aspen

Tulip Tree

Eastern Redbud

Eastern White Pine

Amur Maackia

Autumn Purple Ash

Crabapple 'Donald Wyman'

Princess Kay Canadian Plum

Ruby Red Horsechestnut

Black Locust ‘Purple Robe’

Northern Pin Oak

Freeman Maple

Black Alder

Littleleaf Linden

Balsam Fir

Norway Spruce 'Acrocona'

Trees Company



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Glossary of Terms

The authors have compiled this glossary of terms used in the text which may be unfamiliar to the casual reader, or that may have applied connotation in horticulture not immediately apparent to those outside the field.

Acid Soil – soil with a low pH value, less than 7

Alkaline Soil – soil with a high pH value, greater than 7

Alternate – leaves that are arranged singly along a twig, not in pairs

Bark – the outer covering of a tree trunk and branches

Bisexual – a plant that creates flowers with both male and female organs in the same flower

Bract – a modified or scale-like leaf usually found at the base of a fruit or flower

Branch – a secondary division of a tree trunk

Catkin – a compact cluster of stalkless flowers, usually unisexual

Chlorophyll – the green coloring matter found in plants and trees

Chlorosis – abnormal plant condition resulting from a deficiency of green pigment, usually caused by lack of adequate chlorophyll producing light, mineral deficiency or genetic disorder

Cluster – a group of two or more flowers or fruit occurring close together

Compound Leaf – a leaf made up of two or more smaller leaflets

Cone – a conical fruit most often associated with Pine trees, and usually consisting of overlapping scales arranged around a central axis and containing a seed

Conifer – a tree or shrub that bears cone fruit, usually evergreen with needle-like leaves

Cultivar – a plant variety created for specific features by propagation or by inbred seed

Deciduous – a tree that drops its leaves, usually annually, and remains leafless for part of the year; not evergreen

Double-flowered – blooms with more than the usual number of petals, usually in the form of extra rows of petals within a bloom

Evergreen – tree leaves that remain green year-round

Exfoliate – to peel off in thin layers, as in tree bark that cracks and peels

Family  – a group of plants in a related genera which share specific characteristics not found in other families

Fruit – the fully developed ovary of a flower containing one or more seeds, as in a berry, pome or nut

Hardiness – a plant's ability to withstand weather extremes such as summer heat and dryness or winter cold

Horticulture – cultivation of plants for a specific purpose such as food, ornament or production of products from the plant material such as wood for fuel, pulp for paper, etc.

Hybrid – the offspring of two parent plants that belong to different genera, species or sub-species

Leaflet – a leaf-like subdivison of a compound leaf

Legume – a pod-like, fruit of the pea and/or bean family

Lenticel – a corky spot or pores on a tree branch or twig which persist on the bark and allow air to get to the plant's interior

Lobe – an individual usually rounded segment of a cleft leaf or petal

Midrib – the central vein or primary rib of a leaf or leaflet

Native – a plant or tree that occurs naturally in an area; not introduced by man

Naturalized – plant or tree that has been established in an area other than its place of origin and continues to reproduce there successfully

Nectar – the secretions of glands that usually occur in many flowers but also occasionally occurs in leaves; usually sweet and attractive to insects

Needle – the long, narrow leaves of conifer trees

Node – the point on a stem where leaves or branches are attached

Nut – dry, one-celled fruit that does not split along a natural grooved line, usually hard or bony

Nutlet – small nut-like parts of a compound fruit

Opposite – leaves that are arranged along a twig in pairs on either side of the twig

Persistent – leaves or blooms that remain attached to a plant or tree

Petiole – the stalk of a leaf

pH – a symbol for identifying the measured hydrogen ion content of soil, used to express alkalinity or acidity of soil

Pistil – the female structure of a plant's flower

Pod – dry, one-celled fruit that splits along naturally grooved lines

Pome – fruit with fleshy outer tissue and containing seeds

Propagate – the act of producing new plants or trees through sowing seeds or other vegetative processes such as rooting a piece of a plant

Resin – a plant secretion that may be aromatic and that is insoluble in water

Seed – a fertilized plant ovule usually covered with a protective coating and contained in a fruit

Serrate – leaves that have edges that appear like the teeth of a saw

Simple Leaf – a leaf without a divided blade; not compound

Species – a particular population of plants or

animals that reproduces through breeding with each other, and that is reproductively isolated from other populations

Specimen – an individual plant of a particular species

Stamen – the male structure of a plant's flower

Sterile – a plant that cannot produce seeds because of internal genetic make-up or because it lacks reproductive elements such as pistils and stamens

Stomata – small openings in the epidermis of a plant, usually on leaves or stems, allowing for gaseous intercharge

Thorn – the short, woody outgrowth of a plant's stem or branch, usually sharp, serving as a defense mechanism for the plant

Trunk – the major, woody stem of a tree

Variety – a population of plants that naturally occurs in a way that differs slightly from the usual form of a particular species

Last Modified: Monday, July 27, 2009 9:21 by

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