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Platanthera orbiculata (Pursh) Lindley. Subgenus: Platanthera. Section: Lysias. Large Round-leaved Orchid, Dessert-plate Orchid. Phen: Jun-Sep. Hab: Moist hardwood forests and seeps, especially over mafic, calcareous, or other more nutrient-rich substrates. Dist: NL (Newfoundland) and NL (Labrador) west to AK, south to PA (and in the mountains to NC and TN), OH, IN, MN, SD, and OR.

Origin/Endemic status: Native

Taxonomy Comments: Reddoch & Reddoch (1993) showed that P. orbiculata differs from P. macrophylla at species rank.

Other Comments: Pollination is by night-flying moths, likely noctuids.

Synonymy ⓘ: = FNA26, Il, K3, K4, Mi, NE, NY, Pa, Tn, Va; = Habenaria orbiculata (Pursh) Hook. var. orbiculata – C, F; = Lysias orbiculata (Pursh) Rydb. – S, S13; = Platanthera orbiculata (Pursh) Lindl. var. orbiculata – K1, Luer (1975); < Habenaria orbiculata (Pursh) Hook. – G, RAB, W, WV, Correll (1950); > Habenaria orbiculata (Pursh) Hook. var. lehorsii Fernald – F

Links to other floras: = Platanthera orbiculata - FNA26

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Wetland Indicator Status:

  • Eastern Mountains and Piedmont: FAC
  • Great Plains: FAC
  • Midwest: FAC
  • Northcentral & Northeast: FAC

Heliophily ⓘ: 3

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image of plant© Gary P. Fleming | Original Image ⭷
image of plant© Gary P. Fleming | Original Image ⭷
image of plant© Erik Danielson source | Original Image ⭷
image of plant© Erik Danielson source | Original Image ⭷
image of plant© Gary P. Fleming | Original Image ⭷
image of plant© Erik Danielson source | Original Image ⭷
image of plant© Erik Danielson source | Original Image ⭷
image of plant© Jennifer Stanley | Original Image ⭷
image of plant© Radford, Ahles and Bell | Original Image ⭷

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Horticultural Information

NCBG trait

Intro: Erect perennial of moist hardwood forests and seeps, especially over amphibolite.

Stems: Stem an unbranched, smooth flowering scape.

Leaves: Leaves in a pair at base of plant, flat against ground (a few bracts above); broadly oval to rounded; 2-8 in. long; with parallel veins and a central crease; shiny dark green and smooth.

Inforescence:

Flowers: Flowers 10-30 in a cylindric terminal spike; greenish-white; about 1 in. long; bilaterally symmetric; consisting of 3 oval sepals, a pair of sickle-shaped lateral petals, a narrowly elongate lip-petal at the bottom and, pointing backward, a slender, drooping, 1/2- to 1-in.-long spur.

Fruits: Fruit an erect, slender, ellipsoid capsule.

Comments:

Height: 4-23 in.

plant sale text:

bloom table text:

description: Erect perennial of moist hardwood forests and seeps, especially over amphibolite.

stems: Stem an unbranched, smooth flowering scape.

leaves: Leaves in a pair at base of plant, flat against ground (a few bracts above); broadly oval to rounded; 2-8 in. long; with parallel veins and a central crease; shiny dark green and smooth.

inflorescence:

flowers: Flowers 10-30 in a cylindric terminal spike; greenish-white; about 1 in. long; bilaterally symmetric; consisting of 3 oval sepals, a pair of sickle-shaped lateral petals, a narrowly elongate lip-petal at the bottom and, pointing backward, a slender, drooping, 1/2- to 1-in.-long spur.

fruits: Fruit an erect, slender, ellipsoid capsule.

comments:

cultural notes:

germination code:

native range: