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Auricled Twayblade Listera auriculata Wieg. |
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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: G3G4
A Global Rarity Rank of G3G4 means: Vulnerable globally, or Apparently Secure -- At moderate risk of extinction, with relatively few populations or locations in the world, few individuals, and/or restricted range; or uncommon but not rare globally; may be rare in some parts of its range; possibly some cause for long-term concern due to declines or other factors. More information is needed to assign a single conservation status. Did you know? Auricled twayblade was described as a separate species in 1899, the last of the Listera species to be recognized. The genus is named for Thomas Lister, a seventeenth century naturalist, perhaps the first to suggest the need for and usefulness of geologic surveys. Throughout most of its range it lives along streams and rivers where it is subject to annual flooding. |
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| State Ranking Justification | [-] |
This orchid has only been observed at two locations in New York, and only one site is known today. There is plently of additional available habitat, but surveys are difficult since this is such a small plant, and populations tend to be small and local. More survey work is needed.
| Short-term Trends | [-] |
New York is at the southern edge of the range of this orchid. This orchid has always been rare in New York. The known population is monitored frequently and the population seems to flucuate from year to year. The average population size over a 5-10 year period seems relatively stable though.
| Long-term Trends | [-] |
As a plant that has always been rare, a long-term assessment is difficult. The number of populations appears to be relatively stable. Targeted surveys may locate additional populations, but this small plant is difficult to find. There is plenty of suitable and high quality habitat available within the Adirondacks and Tug Hill, so there is the potential that we will find more populations over time. These populations would not necessarily indicate an increasing trend though, but just reflect an ability to locate populations that likely have been present all along.
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Home | Advanced Search | About Us Animal Guides | Plant Guides | Community Guides © 2004-2012 New York Natural Heritage Program, a partnership between the New York State Department of Environmental Conservation and the State University of New York College of Environmental Science and Forestry Please cite this page as:
New York Natural Heritage Program. 2013. Online Conservation Guide for Listera auriculata. Available from: http://acris.nynhp.org/guide.php?id=9699. Accessed May 21st, 2013. 
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