Overview

Distribution

National Distribution

Canada

Origin: Native

Regularity: Regularly occurring

Currently: Present

Confidence: Confident

United States

Origin: Unknown/Undetermined

Regularity: Regularly occurring

Currently: Unknown/Undetermined

Confidence: Confident

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Physical Description

Morphology

Description

Plants 15–65 cm. Roots few–several, spreading to descending, mostly to 0.75 cm diam., slender to stout. Leaves, basal, spreading, obovate, 2–5 × 1–2 cm. Spikes secund to tightly spiraled, 8–10 flowers per cycle of spiral; rachis glabrous to sparsely pubescent, trichomes capitate to clavate, glands obviously stalked. Flowers white; sepals somewhat spreading, distinct to base, elliptic, 5 × 1 mm; lateral sepals white throughout, apex acuminate; petals lanceolate, slightly oblique, 5 × 1 mm; lip white with green or yellowish green center, ovate to oblong, 5 × 2.5 mm, apex dilated, its margin crisped-crenate, pubescent; veins obscure; basal calli erect, short-pointed, mostly to 1 mm; viscidium linear-lanceolate; ovary mostly 3 mm. Seeds monoembryonic.
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Diagnostic Description

Synonym

Neottia lacera Rafinesque, Amer. Monthly Mag. & Crit. Rev. 2: 206. 1818
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Ecology

Associations

Flower-Visiting Insects of Slender Ladies' Tresses in Illinois

Spiranthes lacera (Slender Ladies' Tresses)
(bees suck nectar, while butterflies & skippers suck nectar and are non-pollinating; observations are from Catling; this orchid is very similar to Spiranthes gracilis and shares the same common name)

Bees (long-tongued)
Apidae (Bombini): Bombus perplexus sn, Bombus terricola sn, Bombus vagans sn; Megachilidae (Stelidini): Stelis sp. sn; Megachilidae (Megachilini): Megachile campanulae campanulae sn, Megachile inermis sn; Megachilidae (Osmiini): Hoplitis truncata sn

Bees (short-tongued)
Halictidae (Halictinae): Lasioglossum imitatus sn

Flies
Syrphidae: Unidentified spp. np

Butterflies
Pieridae: Pieris rapae sn np

Skippers
Hesperiidae: Erynnis lucilius sn np, Wallengrenia egeremet sn np

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Flower-Visiting Insects of Slender Ladies' Tresses in Illinois

Spiranthes gracilis (Slender Ladies' Tresses)
(Bees suck nectar; observations are from Robertson)

Bees (long-tongued)
Apidae (Bombini): Bombus pensylvanica

Bees (short-tongued)
Andrenidae (Panurginae): Calliopsis andreniformis

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Molecular Biology and Genetics

Molecular Biology

Statistics of barcoding coverage: Spiranthes lacera

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 0
Specimens with Barcodes: 2
Species With Barcodes: 1
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Conservation

Conservation Status

National NatureServe Conservation Status

Canada

Rounded National Status Rank: N5 - Secure

United States

Rounded National Status Rank: NNR - Unranked

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NatureServe Conservation Status

Rounded Global Status Rank: G5 - Secure

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Wikipedia

Spiranthes lacera

Spiranthes lacera, commonly called the Slender Ladies'-tresses, is a species of orchid that is native to Eastern North America. It has a widespread range and is found in a variety of open habitats, both natural and disturbed. It produces a spiral of white flowers in the summer.

There are two varieties recognized:[1][2]

  • S. lacera var. gracilis - Southern slender ladies' tresses. Flowers more densely arranged in spiral, blooming later (late-July through August). Plant hairless and leaves usually absent at flowering.
  • S. lacera var. lacera - Nothern slender ladies' tresses. Flowers more loosely arranged in spiral, blooming earlier (mid-July). Plant hairy and leaves usually present at flowering.


References[edit]

  1. ^ http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=242101954 Spiranthes lacera in Flora of North America
  2. ^ Bentley, Stanley (2000). Native Orchids of the Southern Appalachian Mountains. Chapel Hill, NC: University of North Carolina Press. pp. 201–203. ISBN 0-8078-4872-7. 
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