New York Natural Heritage Program
Weak Rush
Juncus debilis Gray
Monocots
Juncus debilis fruits Stephen M. Young
Family: Rush Family (Juncaceae)

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 is one of the smallest species of Juncus in the state, reflected in the species name meaning "weak." Many populations may be undiscovered because of its resemblance to Juncus brachycarpus, Juncus acuminatus and Juncus subcaudatus.

State Ranking Justification [-]
There are four existing populations but only one of them is of good quality. The other three have less than 60 plants each and are under some threat by human disturbance. There are five historical occurrences but most of them are too vague for targeted searches.

Short-term Trends [-]

Long-term Trends [-]