New York Natural Heritage Program
Wafer-ash
Ptelea trifoliata ssp. trifoliata
Dicots
Kimberly J. Smith
Family: Rue Family (Rutaceae)

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: S1S2
A State Rarity Rank of S1S2 means: Critically Imperiled or Imperiled in New York - Especially or very vulnerable to disappearing from New York due to rarity or other factors; typically 20 or fewer populations or locations in New York, very few individuals, very restricted range, few remaining acres (or miles of stream), and/or steep declines. More information is needed to assign a single conservation status.

Global Rarity Rank: G5T5
A Global Rarity Rank of G5T5 means: Secure globally - Both the species as a whole and the subspecies/variety are common in the world; widespread and abundant (but may be rare in some parts of its range).


Did you know?
Wafer-ash belongs to the citrus family whose species grow mostly in the tropics or temperate regions in the southern hemisphere. For native plants in this family in North America, only the prickly ash, Zanthoxylum americanum, occurs farther north than wafer-ash. The winged fruit of wafer ash is unusual for the family (Heywood 1978).

State Ranking Justification [-]
There are eight existing populations but only one has more than 100 plants. There are eight historical occurrences known from 1830 to the 1920s with one from 1943. Cultivated populations occur in eastern New York and Long Island but only central and western New York plants are native.

Short-term Trends [-]

Long-term Trends [-]