New York Natural Heritage Program
Dwarf White Birch
Betula minor (Tuckerman) Fern.
Dicots
Family: Birch Family (Betulaceae)

State Protection: Endangered
listed species are those with: 1) 5 or fewer extant sites, or 2) fewer than 1,000 individuals, or 3) restricted to fewer than 4 U.S.G.S. 7 ˝ minute topographical maps, or 4) species listed as endangered by U.S. Department of Interior.

Federal Protection: Not Listed

State Rarity Rank: S1
A State Rarity Rank of S1 means: This plant is endangered/critically imperiled in New York because of extreme rarity (typically 5 or fewer populations or very few remaining individuals) or is extremely vulnerable to extirpation from New York due to biological factors.

Global Rarity Rank: G4G5Q
A Global Rarity Rank of G4G5Q means: Apparently or Demonstrably Secure globally - Uncommon to common in the world, but not rare; usually widespread, but may be rare in some parts of its range; possibly some cause for long-term concern due to declines or other factors. More information is needed to assign a single conservation status. The Q indicates this species’ status as a distinctive full species is uncertain.


Did you know?
This species was orginally described as only a variety of the taller, more common paper birch, and the species name "minor", which means smaller, was probably chosen to reflect that this species resembles a smaller version of paper birch.

State Ranking Justification [-]
There are three known extant populations and a fourth population that needs to be verified. A fifth population has not been seen since 1958 but may still be extant. All of these populations are very small (under 50 individuals), are restricted to the alpine regions of the highest summits of the Adirondacks, and occur within about 5 air miles of each other.

Short-term Trends [-]

Long-term Trends [-]