Teucrium canadense L.

Scientific Nomenclature and Root System

American germander, scientifically named Teucrium canadense L., is a robust perennial plant with a fibrous root system.

Growth Habit and Height

It forms clumps that can reach up to 3 feet (90 cm) in height.

Stem Characteristics

Its upright stems are squarish, with small side branches, and produce rhizomes at the base.

Leaf Arrangement

The leaves are arranged oppositely along the stem: lower leaves have stems, while upper leaves do not.

Leaf Shape and Size

Leaves are ovate or lanceolate, with deep veins and coarse teeth, and can grow up to 5 inches (13 cm) long and 2.5 inches (6 cm) wide.

Inflorescence and Flower Structure

The terminal inflorescence is a raceme up to 8 inches (20 cm) long, holding numerous whitish or pale lilac lipped flowers that have large shelf-like lower lips.

Bloom Period

The plant blooms starting around mid-June for about one month, with flowers opening from the bottom of the raceme upward.

Flower Scent

The flowers have no scent.

Seed Characteristics

Its fruits contain four roundish, yellowish brown seeds.

Native Origin

This species is native to North America.

Geographical Range

Its range covers all 48 contiguous United States, and it is also found across most of Canada.

Primary Habitat Types

It is a common plant that grows in moist grassland, forest edges, thickets, river verges, and marsh edges.

Secondary Habitat and Growth Trait

It also grows on wasteland, in poorly-drained areas, and beside roadside ditches, and can be somewhat aggressive.

Pollination Adaptation

The flowers of American germander are adapted for pollination by long-tongued insects, with the lower lip acting as a landing platform for visiting insects.

Bee Pollinators

Known pollinators include bumblebees, honey bees, digger bees, cuckoo bees, and megachilid bees.

Other Flower Visitors

The flowers are also visited by flies and butterflies, and occasionally by hummingbird moths and hummingbirds.

Foliage Palatability

Grazing animals find the foliage unappealing due to its bitter taste.

Pharmacological Compounds

American germander contains multiple chemicals with pharmacological properties, including flavonoids, diterpenoids, tannins, bitter aromatics, volatile oils, and glycosides such as saponins.

Traditional Native American Use

The earliest recorded use of this plant is by Native Americans, who ground the leaves to make a herbal tea used as a diuretic and to promote sweating.

Other Medicinal Uses

The green parts of the plant are also used as an antiseptic wound dressing, and made into a tincture for gargling.