This orchid can grow twice as tall as any other ladies tresses orchid in New York. Even though it blooms in mid summer here, its species name means spring-blooming. This happened because it was originally described from the Southern United States where it blooms in the spring (Fernald 1950).
There are eight existing populations, but only three of them have been seen in recent years. All except one of them have fewer than 100 plants each. There are 26 historical records known from the late 1800s through 1975 which need to be resurveyed to see if they still exist. Nine populations are now extirpated because their habitat has been destroyed.
The short-term trend of this orchid is unknown because there have not been enough recent surveys to determine whether the plants are still present at four of the known populations.
The long-term trend is strongly negative. It seems that there has been a severe decline in populations over the last 100 years. There were 35 known locations and nine of these have been confirmed extirpated. More survey work is needed at known sites older than 30 years to confirm this decline.
This orchid occurs in successional areas and the failure to maintain this habitat is a threat. A number of occurrences appear to be declining perhaps due to collecting.
Maintain early-successional habitat for the existing populations through management with an appropriate disturbance regime.
More demographic studies are needed to track populations through time to understand yearly fluctuations in population size.
Maritime grassland with Andropogon scoparius, Danthonia spicata, Chrysopsis mariana and Aster paternus; disturbed grassland with Andropogon scoparius; sandpit with some areas but mostly overgrown with Andropogon scoparius, Solidago nemoralis, Solidago tenuifolia and Sorghastrum nutans; meadow with Drosera; grassy abandoned road in successional maritime forest; interdunal swales; meadow; moist sand; dry grassy ground; dry hills; edge of thicket; moist rocky hillside; cattail swamp; brackish meadow (New York Natural Heritage Program 2011). Dry to moist meadows, dune hollows, prairies, old fields, roadsides, cemeteries, lawns (FNA 2002). Open, sandy, moist or dry acid soil (Gleason & Cronquist 1991). Dry to moist siliceous, argillaceous or gravelly fields, clearings and swales (Fernald 1970).
This orchid is currently known from Suffolk County, Long Island with historical records to the west in Nassau County, Staten Island, and the Bronx. There is an unconfirmed report from Dutchess County.
This orchid is widespread east of the short grass prairies but absent from Northern New England and with only scattered populations in the northern tier of states from South Dakota to Massachusetts.
Spring Ladies-tresses is a perennial orchid species growing from numerous thick (up to 1 centimeter) roots. It has a cluster of 4 to 5 narrow, grass-like basal leaves, 1 cm wide and up to 25 cm long, the stem leaves are reduced to small bracts subtending the flowers. The single stem is densely covered with pointed, downy hairs, bearing flowers in a spiralling (or sometimes one-sided) infloresence 5 to 25 cm long.The flowers consist of an upper hood of 3 fused tepals, a lower lip consisting of a single tepal, and 2 lateral tepals. They are small (6-12 mm long and 2-3 mm wide) and white or cream-colored, with a yellow patch in the center of the lip (FNA 2002).
Spiranthes vernalis is best identified when in flower.
The narrow, grass-like basal leaves and presence of dense, non-glandular hairs separate Spring Ladies' tresses from the seven other Spiranthes species in New York.
The plant flowers from late July through August.
The time of year you would expect to find Grass-Leaved Ladies' Tresses flowering in New York.
Grass-Leaved Ladies' Tresses
Spiranthes vernalis Engelm. & Gray
Flora of North America Editorial Committee. 2002. Flora of North America, North of Mexico. Volume 26. Magnoliophyta: Liliidae: Liliales and Orchidales. Oxford University Press, New York. 723 pp.
Brackley, F.E. 1985. The Orchids of New Hampshire. Rhodora 87:1-117. A85BRA01PAUS
Correll, D.S. 1950. Native Orchids of North America, North of Mexico. Chronica Botanica Company, Waltham, Mass. USA. B50COR01PAUS
Fernald, M.L. 1950. Gray's manual of botany. 8th edition. D. Van Nostrand, New York. 1632 pp.
Gleason, Henry A. and A. Cronquist. 1991. Manual of Vascular Plants of Northeastern United States and Adjacent Canada. The New York Botanical Garden, Bronx, New York. 910 pp.
Godfrey, R.K. Wooten, J.W. 1970. Aquatic and Wetland Plants of Southeastern United States. University of Georgia Press, Athens, GA. USA. B70GOD01PAUS
Henry, L.K., W.E. BUKER AND D.L. PEARTH. 1975. WESTERN PENNSYLVANIA ORCHIDS. CASTANEA 40 (2):93-171.
Holmgren, Noel. 1998. The Illustrated Companion to Gleason and Cronquist's Manual. Illustrations of the Vascular Plants of Northeastern United States and Adjacent Canada. The New York Botanical Garden, Bronx, New York.
Luer, C.A. 1975. The Native Orchids of United States and Canada Excluding Florida. B75LUE01PAUS
Mitchell, Richard S. and Gordon C. Tucker. 1997. Revised Checklist of New York State Plants. Contributions to a Flora of New York State. Checklist IV. Bulletin No. 490. New York State Museum. Albany, NY. 400 pp.
New York Natural Heritage Program. 2010. Biotics database. New York Natural Heritage Program. New York State Department of Environmental Conservation. Albany, NY.
New York Natural Heritage Program. 2020. New York Natural Heritage Program Databases. Albany, NY.
Reschke, Carol. 1990. Ecological communities of New York State. New York Natural Heritage Program, New York State Department of Environmental Conservation. Latham, NY. 96 pp. plus xi.
Sheviak, C.T. 1974. An Introduction to the Ecology of the Illinois Orchidaceae, Illinois State Museum Scientific Papers XIV, Springfield, IL, U.S.A. B74SHE01PAUS
Stuckey, I.H. 1967. Environmental Factors and the Growth of Native Orchids. American Journal of Botany, 54:232-241. A67STU01PAUS.
Voss, E.G. 1972. Michigan Flora, Part I. Gymnosperms and Monocots. Cranbrook Institute of Science Bulletin 55 and the University of Michigan Herbarium. Ann Arbor. 488 pp.
Weldy, T. and D. Werier. 2010. New York flora atlas. [S.M. Landry, K.N. Campbell, and L.D. Mabe (original application development), Florida Center for Community Design and Research http://www.fccdr.usf.edu/. University of South Florida http://www.usf.edu/]. New York Flora Association http://newyork.plantatlas.usf.edu/, Albany, New York
This guide was authored by: Stephen M. Young
Information for this guide was last updated on: August 28, 2019
Please cite this page as:
New York Natural Heritage Program. 2020. Online Conservation Guide for Spiranthes vernalis. Available from: https://guides.nynhp.org/spring-ladies-tresses/. Accessed July 14, 2020.