Isotria medeoloides (Pursh) Raf.
  • Fl. Tellur.
  • Small whorled pogonia orchid

Cite taxon page as 'WFO (2022): Isotria medeoloides (Pursh) Raf. Published on the Internet; Accessed on: 29 Jan 2022'

General Information

Herbs, singly or rarely in small clumps, short-rhizomatous, 4–25 cm. Stems pale grayish green, glaucous; scales 2–4, near soil line, white to light green. Leaves pale grayish green; blade elliptic-obovate, 17–85 × 8–40 mm, apex acuminate, glaucous when young. Flowers subsessile, without nectar and fragrance; sepals arching, green to light green, linear-oblanceolate, 12–25 × 2–3 mm; petals light green, oblanceolate, 12–18 × 2–4 mm; lip light yellowish green to pale greenish white, streaked with green, obovate, 11–16 × 4–5 mm, lateral lobes narrowly triangular, margins involute, middle lobe rounded, margins slightly revolute, undulate; callus yellowish green, longitudinal, becoming elongate, with fleshy, wartlike papillae toward apex; column 8–10 mm; ovary 10–15 mm; rostellar flap reduced. Capsules 12–28 × 2–10 mm; pedicel of mature capsule elongating to 5–17(–20, rarely) mm. 2n = 18.

  • Provided by: [A].Flora of North America @
    • Source: [
    • 1
    • ]. 

    "Not colonial, the individuals few and scattered; herbage glaucous; stem 1.5–2.5 cm; lvs as in no. 1 [Isotria verticillata (Willd.) Raf.]; peduncle 1–1.5 cm, fls selfed, inodorous, light green or yellow-green or partly whitish, without guide-lines; sep 1.2–2.5 cm; pet 1.3–1.7 cm; lip 1–1.5 cm, less emarginate and ornate; 2n=18. Open stands of second-growth hardwoods or pine- hardwoods; irregularly at widely scattered stations from s. Me. to N.C., w. to s. Ont., Mich. and Mo. May, June. Our rarest orchid."

  • Provided by: [B].New York Botanical Garden
    • Source: [
    • 2
    • ]. 



    Brumback, W. E. and C. W. Fyler. 1988. Monitoring of Isotria medeoloides in New Hampshire. Wild Fl. Notes 3: 32–40. Dyer, R. W. 1986. Small whorled pogonia. Audubon Wildlife Rep. 1986: 780–789. Mehrhoff, L. A. 1989. Reproductive vigor and environmental factors in populations of an endangered North American orchid, Isotria medeoloides (Pursh) Rafinesque. Biol. Conservation 47: 281–296. Mehrhoff, L. A. 1989b. The dynamics of declining populations of an endangered orchid, Isotria medeoloides. Ecology 70: 783–786. Oettingen, S. L. 1992. Small Whorled Pogonia (Isotria medeoloides) Recovery Plan: First Revision. Washington. Paulos, P. G. 1985. Small Whorled Pogonia Recovery Plan. [Newton Corner, Mass.]

  • Provided by: [A].Flora of North America @
    • Source: [
    • 1
    • ]. 

    Other Local Names

    Small whorled pogonia orchid


     Information From

    Flora of North America @
    'Flora of North America @ eFloras (2008). Published on the Internet [accessed August 2016]' Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
    • A Flora of North America Association
    New York Botanical Garden
    Descriptions of plants should be attributed to the full citation for each individual article, chapter or book that is the source for each record, which should include the authors of original publication.
    • B Content licensed under Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License
    International Union for Conservation of Nature
    IUCN 2016. IUCN Red List of Threatened Species. Version 2016-2
    • C All Rights Reserved
    International Union for Conservation of Nature v.3
    IUCN 2019. The IUCN Red List of Threatened Species. Version 2019-1.
    • D See IUCN Terms and conditions of use
    • E CC0 1.0 Universal (CC0 1.0).
    World Flora Online consortium
    World Flora Online Data. 2018.
    • F CC0 1.0 Universal (CC0 1.0).