New York Natural Heritage Program
Thickleaf Orach
Atriplex dioica Raf.
Atriplex dioica fruits Stephen M. Young
Family: Goosefoot Family (Chenopodiaceae)

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: G5
A Global Rarity Rank of G5 means: This species is demonstrably secure globally, though it may be quite rare in parts of its range, especially at the periphery.

Did you know?
This species has taken advantage of the use of road salt to extend its range westward from the natural salt marshes of Long Island where it was historically known. Another species of orach, Atriplex prostrata, has been introduced from Europe and is now invading saline habitats where thickleaf orach used to grow.

State Ranking Justification [-]
There are three existing populations along salted roadsides outside of the natural range of the species. There are three historical occurrences from salt marshes on Long Island that have not been rediscovered nor have new populations been seen on Long Island.

Short-term Trends [-]

Long-term Trends [-]