Amerorchis rotundifolia

(Banks ex Pursh) Hultén

Ark. Bot., n. s. 7: 34. 1968

Basionyms: Orchis rotundifolia Banks ex Pursh Fl. Amer. Sept. 2: 588. 1814
Synonyms: Ponerorchis rotundifolia (Banks ex Pursh) Soó
Treatment appears in FNA Volume 26. Treatment on page 551.
Click plate for higher resolution version.
Illustrator: Barbara Alongi
Plants 7–33 cm. Leaves: blades 2.7–11 × 1.2–8 cm. Inflorescences: floral bracts lanceolate to linear, 5–15 × 1–5 mm, apex acute to acuminate. Flowers showy; sepals white to pale magenta, ovate to elliptic-oblong, 6–10 × 3–4 mm; petals white to pale magenta, ovate to lance-oblong, 5–6 mm, less than 1/2 as wide; lip white, prominently magenta-spotted, rarely with broad, longitudinal, reddish bars, ovate in outline, 6–9 × 4–8 mm, lateral lobes spreading, spur conspicuous, 2/3 as long as to equaling lip, slender. Capsules erect, ellipsoid. 2n = 42.

Phenology: Flowering Jun–Jul.
Habitat: Moist, often calcareous coniferous forests, thickets, fens, tundra
Elevation: 0–1200 m

Distribution

V26 1125-distribution-map.jpg

Greenland, Alta., B.C., Man., N.B., Nfld. and Labr., N.W.T., Nunavut, Ont., Que., Sask., Yukon, Alaska, Maine, Mich., Minn., Mont., N.Y., Vt., Wis., Wyo.

Discussion

References

None.

Lower Taxa

No lower taxa listed.