American basswood (Tilia americana, L. 1753)

Identity

American basswood (Tilia americana L., 1753), also called American linden, is a large deciduous member of the genus Tilia in the Malvaceae family. Carl Linnaeus described it in Species Plantarum in 1753. POWO/WCVP treats it as the only member of Tilia native to the Western Hemisphere. ¹

The familiar name basswood comes from bast, the fiber taken from the inner bark and long used to make rope before its name came to describe the whole tree. In Quebec, the pale color of the sawn timber gave rise to the French name bois blanc, meaning white wood. That name describes the board rather than the living tree. ^{5 2}

Recognition

With a usual height of 20–35 m (65–115 ft) and a trunk 60–100 cm (2–3.3 ft) across, Tilia americana is a substantial forest tree; exceptional specimens approach 40 m (130 ft). Its growth outpaces sugar maple and yellow birch, both hardwoods noted for rapid growth in the same northern climate. ^{2 5}

Heart-shaped leaves measuring 10–20 cm (4–8 in) have a strongly uneven base and an elongated tip. They are conspicuously larger than those of European limes. The underside then separates the North American forms: green or pale green in the typical form, white and felted in var. heterophylla, which POWO/WCVP now treats as a variety rather than a separate species. ^{5 4}

Early to midsummer flowering brings drooping cymes of intensely fragrant, creamy white flowers. As throughout the genus, a long, tongue-shaped bract accompanies each cluster. Bees gather in such numbers during these few weeks that North American beekeepers count basswood honey among their most valued harvests. ^{4 2}

Taxonomy and names

For American basswood, the accepted botanical name in POWO/WCVP is Tilia americana L., published in 1753. Several forms once treated as separate species, including Tilia caroliniana and Tilia heterophylla, are now placed at the rank of variety or regarded as local ecotypes of Tilia americana. ^{1 2}

Older books and herbarium labels can therefore assign different names to the same leaf, sometimes as many as three names to one tree. The accepted name Tilia americana provides a consistent reference. Its variety heterophylla is distinguished by the white, felted underside of the leaf. ⁸

Habitat and range

From southeastern Manitoba, American basswood reaches east to New Brunswick, southwest to Oklahoma and southeast to South Carolina. Southern varieties extend the range into Mexico according to POWO/WCVP, although the temperate hardwood forests of the northeastern continent remain its core habitat. ^{2 1}

Deep, moist, fertile soils suit this species best. In mixed stands it favors north- and east-facing slopes, which retain more moisture than south-facing ones. Shade tolerance allows it to persist in the understory, while vigorous sprouting helps it recover after cutting. ^{5 2}

The IUCN assessment places Tilia americana in Least Concern (LC). Its broad range and ready regeneration from stump sprouts mean that no global threat to the species is identified in that assessment. ⁷

Life cycle, ecology and cultivation

A globular fruit, covered in brown hairs, ripens in early to mid-autumn. It is an achene and usually contains one seed, occasionally two or three. Seed dormancy is pronounced: untreated seed can take several years to germinate naturally, so nurseries use cold stratification before sowing. ^{2 3}

Cutting or injury prompts abundant stump sprouts. This habit explains both the tree’s persistence in managed woodland and the frequent occurrence of several trunks arising from one old stump. Lifespans exceed 200 years, and trees younger than 120 years have shown few internal defects. ²

Urban planting is relatively uncommon for American basswood because it poorly tolerates compacted ground, reflected heat and deicing salt. European limes such as Tilia cordata and Tilia × europaea are more often chosen for streets. Parks, large gardens and woodland restoration projects generally provide more suitable settings for the North American tree. ⁴

Uses and risks

Pale, soft wood with a fine grain is one of American basswood’s most valued products. It cuts easily and resists splitting, making it a standard material for hand carving and turning. Electric guitar bodies are another common use: the light weight and even grain are valued for the balanced sound they provide. ^{2 9}

Fibrous inner bark has long supplied rope and woven objects. In some North American traditions, young leaves and flowers are also eaten raw in salads or prepared as tea. Flower tea has a reputation as an antispasmodic and mild sedative, but frequent use is discouraged: herbal literature associates overly regular consumption with heart problems. ^{3 5}

For common domestic animals, the ASPCA lists the genus Tilia, including Tilia americana, as non-toxic to cats, dogs and horses. This animal safety classification is distinct from the caution attached to frequent use of flower tea. ⁶

Cultivars and look-alikes

Nursery selections of American basswood include 'Redmond', grown for its dense pyramidal habit and widely distributed in North America, and 'Continental Appeal', selected for a stronger central leader. Their crowns are more regular than those of wild trees, but selection does not change the biology or toxicity of the species. ⁴

Similar North American and European limes cause most identification difficulties. Tilia americana var. heterophylla, with white, felted leaf undersides, was long treated as Tilia heterophylla; Tilia caroliniana is now viewed as a local ecotype. Introduced European Tilia cordata and Tilia platyphyllos are smaller and more widely planted in towns. Compare leaf size, hairs beneath the blade and planting range together to distinguish these trees reliably. ^{2 8}

Main sources

• Plants of the World Online / Kew, Tilia americana L.
• USDA Forest Service, Silvics of North America, Tilia americana
• Plants For A Future, Tilia americana database entry
• Missouri Botanical Garden, Plant Finder, Tilia americana
• Natural Resources Canada, Tilleul d’Amérique (Tilia americana L.), original fiche 74, modified 12 November 2024; archived 11 March 2026
• ASPCA, Linden toxicity entry
• IUCN Red List, Tilia americana assessment
• USDA GRIN Taxonomy, Tilia americana
• The Wood Database, Basswood (Tilia americana)