| 词条 | Spiranthes parksii |
| 释义 |
| name = Navasota lady's tresses | image = | status = G3 | status_system = TNC | status_ref = [1] | genus = Spiranthes | species = parksii | authority = Correll[2] }} Spiranthes parksii, the Navasota lady's tresses,[3] is a species of orchid that is endemic to Texas, United States. The flower was first discovered in 1945 and was first described by Donovan Stewart Correll in his 1950 book, Native Orchids of North America North of Mexico. DescriptionSpiranthes parksii is a slender-stemmed perennial, {{convert|8|-|15|in|mm}} tall. Leaves are long and thin and found mostly near the ground level, but usually disappear when the flower buds. Flowers petals are round or oval and off-white in color. The flowers typically spiral up the stem. Conspicuously white-tipped bracts occur underneath each {{convert|1/4|in|mm|adj=mid|-long}} flower. The side petals have a green central stripe, and the lip (bottom petal) is distinctly ragged. Habitat and rangeNavasota lady's tresses is primarily found in the East Central Texas forests, usually along creeks in the Brazos and Navasota River watersheds. In 1982, when the species was listed as endangered, only two populations were believed to exist, both in Brazos County. Since then, biologists have identified the species in Bastrop, Burleson, Fayette, Freestone, Grimes, Jasper, Leon, Madison, Milam, Robertson, and Washington Counties.[4] The population in Jasper County is disjunct and the only one that occurs in the Piney Woods.[5] ConservationNavasota lady's tresses was listed as an endangered species by the United States Fish and Wildlife Service (USFWS) in May 1982. The decline of the plant is mostly due to loss of habitat from human encroachment and activity.[4] References1. ^{{cite web | url=http://www.natureserve.org/explorer/servlet/NatureServe?searchName=Spiranthes+parksii | title=Spiranthes parksii - Correll Navasota Ladies'-tresses |work=NatureServe Explorer | publisher=NatureServe |accessdate=2013-02-08}} {{Taxonbar|from=Q7577789}}2. ^{{GRIN | accessdate=2013-02-08}} 3. ^{{PLANTS|id=SPPA5|taxon=Spiranthes parksii|accessdate=27 November 2015}} 4. ^1 {{cite web |url=http://www.tpwd.state.tx.us/huntwild/wild/species/navasolt/ |title=Navasota Ladies'-tresses (Spiranthes parksii) |publisher=Texas Parks and Wildlife|accessdate=2013-02-08}} 5. ^{{cite journal |first=Cliff |last=Pelchat |url=http://miosjournal.org/journal/2005/03/SpiranthesParksii.html |title=Spiranthes parksii Correll - Navasota Ladies' Tresses |journal=The McAllen International Orchid Society Journal |volume=6 |number=2 |date=March 2005 |pages=9–15}} 4 : Spiranthes|Plants described in 1947|Endemic orchids of the United States|Endemic flora of Texas |
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