New York Natural Heritage Program
Yellow Flatsedge
Cyperus flavescens L.
Monocots
Cyperus flavescens Stephen M. Young
Family: Sedge Family (Cyperaceae)

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?
The first species of the smut fungi genus Entorrhiza, Entorrhiza cypericola, was described from the roots of yellow flatsedge in the late 1800s. These fungi are now put in the genus Melanotaenium. In New York this species was first collected in Yonkers in 1875 but almost half of the 15 historical records are now considered extirpated by development around New York City.

State Ranking Justification [-]
There are five existing populations but four of these populations are from specimens and observations that need more survey work. There are 15 historical locations but about half of these are considered extirpated and the other half have not been relocated.

Short-term Trends [-]

Long-term Trends [-]