Spiranthes arcisepala

Spiranthes arcisepala, the Appalachian ladies' tresses,[1] is a species of flowering plant in the family Orchidaceae.[2][3] This orchid is native to eastern North America.[3] Long treated as part of Spiranthes cernua the species complex was reevaluated and Spiranthes arcisepala established as a separate species in 2017.[4]

Spiranthes arcisepala
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Monocots
Order: Asparagales
Family: Orchidaceae
Subfamily: Orchidoideae
Tribe: Cranichideae
Genus: Spiranthes
Species:
S. arcisepala
Binomial name
Spiranthes arcisepala
M.C.Pace

Description

Spiranthes arcisepala is a terrestrial, perennial, deciduous herb. Like many other spiranthes orchids, it is acaulescent with one to four basal leaves persisting through anthesis (flowering). Flowers are arranged in a spike forming a spiral around the central stem with the plant reaching a height of up to 46 cm (18 in). Like all orchids the flowers have three petals and three sepals. The petals and sepals are both white and roughly 10 mm (0.4 in) long and, except for the lower petal or lip, less than 3 mm (0.1 in) wide. The flowers look very similar to Spiranthes incurva but the lateral sepals are bent downward with their tips often lower than the tip of the lip. This feature also gives them their scientific name "arcisepala" from Latin "arcus" (arching) and "sepalorum" (sepals) referring to the downward arching sepals.[4]

Habitat

Appalachian ladies' tresses are found in wet habitats like fens, bogs and seeps.[4]

References
  1. "Spiranthes arcisepala - Species Page". newyork.plantatlas.usf.edu. Retrieved 19 October 2020.
  2. "Spiranthes arcisepala M.C.Pace". ipni.org. International Plant Names Index. Retrieved 19 October 2020.
  3. "Spiranthes arcisepala M.C.Pace". Plants of the World Online. Royal Botanical Gardens Kew. Retrieved 19 October 2020.
  4. Pace, Matthew C.; Cameron, Kenneth M. (27 December 2017). "The Systematics of the Spiranthes cernua Species Complex (Orchidaceae): Untangling the Gordian Knot". Systematic Botany. 42 (4): 640–669. doi:10.1600/036364417x696537.
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