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Basswood, Linden (Tilia)

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Basswood, Linden Genus Details

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Lindens have deciduous leaves that are alternate, pale yellow and heart-shaped. The genus is marked by "hairy" twigs and leaves. Fruits are typically roundish, pea-sized woody shapes called drupes. The bark in younger trees is greenish-gray or gray, and becomes dark grayish and furrowed as the trees age. The large, creamy-white, fragrant flowers are pollinated by flies and bees during the day, and by moths nocturnally. The trees are abundant pollen producers.
American basswood (Tilia americana)
American basswood (Tilia americana)
Small-leaf linden (Tilia cordata)
Small-leaf linden (Tilia cordata)

Basswood, Linden Allergy Info

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Basswoods and lindens have significant allergenic potential. Pollen travels far from the sources, and elicits strong symptoms during skin tests of allergy patients.

Basswood, Linden Pollen Description

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Pollen grains are slightly paraisopolar, peroblate; the amb oblate or circular and 3-colporate. The sexine is finely reticulate to pitted and the intine is thickened beneath the apertures to form an oncus.
The pollen grain is usually 20-28 x 35-47 micrometers.

Species in This Genus

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Allergenicity Legend:
Mild Allergen Mild Allergen  |  Moderate Allergen Moderate Allergen  |  Severe Allergen Severe Allergen  |  Allergy Test Allergy Test Available
Basswood, Linden (Tilia) is a genus of the TILIACEAE family.
This genus includes the following allergenic species:

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Basswood, Linden Genus Location

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The shaded areas on the map indicates where the genus has been observed in the United States. Click the map to see a full scale version of these allergy areas.
  - Native, observed in a county
  - Introduced, observed in a county
  - Rarely observed

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