New York Natural Heritage Program
Arctic Rush
Juncus trifidus L.
Monocots
Juncus trifidus Troy Weldy
Family: Rush Family (Juncaceae)

State Protection: Threatened
listed species are those with: 1) 6 to fewer than 20 extant sites, or 2) 1,000 to fewer than 3,000 individuals, or 3) restricted to not less than 4 or more than 7 U.S.G.S. 7 minute topographical maps, or 4) listed as threatened by U.S. Department of Interior.

Federal Protection: Not Listed

State Rarity Rank: S2
A State Rarity Rank of S2 means: This plant is threatened/imperiled in New York because of rarity (typically 6-20 populations or few remaining individuals) or is 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 is the dominant Juncus species found in the alpine habitat of the Adirondacks. The species name trifidus means three-forked, and is probably in reference to the often three parted ear-like appendages at the base of the leaf blades, or perhaps to the character of the three upper leaves, often being just below the flowers. These two features make this rush easy to identify in the field.

State Ranking Justification [-]
There are ten known extant populations. Eight are from the Adirondacks and two are from the Shawangunks. Four populations are very small, with fewer than 50 plants each. There are also three or four historical populations which have not been seen in over 20 years. One of these populations has probably become extirpated. Survey work is needed to determine whether the other historical populations have become extirpated as well.

Short-term Trends [-]

Long-term Trends [-]