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Poison ivy plants can spread by underground stems or seeds. Most are small shrubs (0.5-1 m tall); others are vinelike plants, 15 m or longer, supported by aerial roots. Shrubby forms are sometimes called poison oak.

A herbarium (Lat herba, "herb," formerly any medicinal plant) is a collection of dried specimens of plants mounted on sheets of heavy paper and stored in cabinets or bound in book form, as well as the building that houses such a collection.

Main Forest TypesWorldwide there are 3 main forest types related directly to climatic zones: equatorial- and tropical-region forests, temperate-zone forests, and forests associated with colder climates.

Mint belongs to the mint family (Lamiaceae, also called Labiatae), a large plant family that also includes several aromatic and ornamental plants like basil, rosemary, oregano, thyme, coleus and sage.

Taiga, see Vegetation Regions.

Tamarack, see LARCH.

Indian Pipe (Monotropa uniflora), a perennial plant, is the only native species of genus Monotropa found in Canada.

Mountain Ash (Sorbus) are a genus of small trees or shrubs of the rose family (Rosaceae), consisting of perhaps 100 species distributed in temperate Eurasia and North America.

Hawthorn, small, deciduous tree or shrub of genus Crataegus, family Rosaceae (rose).

Dandelion [Fr, dent-de-lion, "lion's tooth"], perennial, herbaceous plant of family Compositae or Asteraceae.

Plant disease can decrease the economic, aesthetic and biological value of all kinds of plants. Plant pathology (phytopathology) is the study of the nature, causes, prevention and socioeconomic aspects of plant diseases.

The poplar is a short-lived, deciduous, hardwood tree of genus Populus of the willow family, widely distributed in the northern temperate zone.

Ragweed is an annual or perennial plant of the genus Ambrosia, family Compositae or Asteraceae. Fifteen species are native to North America; 3 occur across Canada: common ragweed (A. artemisiifolia), perennial ragweed (A. coronopifolia) and giant ragweed (A. trifida).

Foresters use forest surveys to obtain information on the condition of the FOREST and monitor any changes, since there are not only surveys of standing trees, but also surveys after logging as well as forestry surveys aimed at prescribing treatments.

Bluebell, common name for several plants with bell-shaped flowers of Campanulaceae and Boraginaceae families.

Solomon's seal (genus Polygonatum) is a herbaceous plant of lily family (Liliaceae). About 50 species occur in the Northern Hemisphere.

Roses have been cultivated from very early times, but little is known of their origin. The hybrid tea rose, the most popular of modern garden roses, was introduced worldwide in 1867.

Seaweeds are multicellular marine algae, visible to the naked eye. They extend from the uppermost reaches of sea spray on the shore to the lower limits of light beneath the surface of the water.

​Vegetation regions are geographical areas characterized by distinct plant communities.

The greatest variety of native sagebrushes occurs in the western mountains, where species that range from Alaska to California and Colorado are found. Several species range across the prairies and 2 species are transcontinental in Canada. Sagebrushes grow on dry plains, hills and rocky slopes.