New York Natural Heritage Program
Large Twayblade
Liparis liliifolia (L.) L.C. Rich. ex Ker-Gawl.
Liparis lilifolia, close-up of flower Troy Weldy
Family: Orchid Family (Orchidaceae)

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?
Over the decades there have been many arguments as to whether this species name is spelled with one i or a double i. It has been shown that the correct spelling should be with a double i. The flowers are pollinated by flies and the seeds can germinate and grow only in association with a specific mycorrhizal fungi that is the same throughout its range (Mattrick 2004).

State Ranking Justification [-]
There are eight existing populations but only one has more than 100 plants. All other occurrences contain five or fewer plants. There are 52 historical records but most of them do not contain specific enough location information to relocate the plants that occur only in small numbers. Many of the occurrences from the Lower Hudson region could be extirpated.

Short-term Trends [-]

Long-term Trends [-]