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Betula papyrifera Marshall

Common Name: PAPER BIRCH, WHITE BIRCH, CANOE BIRCH
Coefficient of Conservatism: 2
Coefficient of Wetness: 3
Wetness Index: FACU
Physiognomy: Nt Tree

Widespread in a diversity of habitats; especially characteristic after fire or other disturbance, when seedlings are often abundant. Frequently on older, stable dunes, especially southward near Lake Michigan, and associated with aspen on upland sites, but also in swamps. A few records in or near urban areas of southeastern Michigan may be spread from planted trees or simply even planted if the collector was not explicit about the plant's status.

Usually a relatively short-lived successional tree, growing in attractive clumps from stump sprouts that follow fire. Old trees may persist in the forest, especially northward, reaching sizes up to 0.6–1.2 m in diameter, with rough bark.

This is a familiar and handsome tree, long famed as the source of birch bark used by Native Americans to construct canoes and other objects. White birch is extremely variable in leaf glandularity and shape and in size, shape, and pubescence of the pistillate scales. Even the bark can be variable, being rich reddish brown on young trunks and even on some older ones retaining the pinkish color for some time. Occasionally, especially near Lake Superior, the bark is grayish rather than the usual chalky white.

Plants variously referred to B. cordifolia Regel or B. papyrifera var. cordifolia (Regel) Fernald have been regularly reported from Michigan. Betula cordifolia is evidently a northern diploid element (2n = 28 or rarely 56) in contrast to typical B. papyrifera (2n = 70 or 84 or rarely 56). It may be that some trees from northern Michigan are the diploid, but all material we have seen seems to fit best within the variable B. papyrifera.

Hybrids with B. pumila are rather frequent and are discussed under that species.

A. A. Reznicek

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Counties
Alcona
Alger
Allegan
Alpena
Antrim
Arenac
Baraga
Barry
Benzie
Berrien
Charlevoix
Cheboygan
Chippewa
Clare
Clinton
Crawford
Delta
Dickinson
Emmet
Gladwin
Gogebic
Grand Traverse
Gratiot
Hillsdale
Houghton
Huron
Ingham
Iosco
Iron
Isabella
Kalkaska
Kent
Keweenaw
Lake
Lapeer
Leelanau
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Livingston
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Mackinac
Macomb
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Menominee
Midland
Missaukee
Montcalm
Montmorency
Muskegon
Newaygo
Oakland
Oceana
Ogemaw
Ontonagon
Osceola
Oscoda
Otsego
Ottawa
Presque Isle
Roscommon
Saginaw
Sanilac
Schoolcraft
Shiawassee
St. Clair
Tuscola
Washtenaw
Wayne

Citation:
MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. March, 28, 2025
https://lsa-miflora-p.lsait.lsa.umich.edu/#/record/551