Difference between revisions of "Listera convallarioides"

(Swartz) Nuttall ex Elliott

Sketch Bot. S. Carolina 2: 494. 1823

Common names: Broad-leaved twayblade
Basionyms: Epipactis convallarioides Swartz
Synonyms: Bifolium convallarioides (Swartz) NieuwlandDiphryllum convallarioides (Swartz) KuntzeListera eschscholziana ChamissoOphrys convallarioides (Swartz) W. Wight
Treatment appears in FNA Volume 26. Treatment on page 590. Mentioned on page 587, 588, 589, 591.
 
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Revision as of 14:40, 12 August 2019

Click plate for higher resolution version.
Illustrator: Barbara Alongi
Plants 5–37 cm, somewhat stoloniferous. Stems green, succulent, glabrous. Leaves: blade green, broadly ovate to elliptic, oval or suborbiculate, 2–7 × 1.5–5.8 cm, apex obtuse to rarely acute or apiculate. Inflorescences 5–20-flowered, lax, 20–120 mm; floral bracts semitranslucent, rhombic-ovate to lanceolate, 3–5 × 1–2.5 mm, apex acute to acuminate; peduncle and rachis densely whitish glandular-pubescent. Flowers yellowish green, sometimes faintly tinged with purple; pedicels slender, 2.5–7 mm, glandular-pubescent; ovary glandular-pubescent, becoming glabrate as it matures; sepals and petals reflexed away from column and lip; dorsal sepal ovate-lanceolate to elliptic, 4.5–5 × 1.5–2 mm, apex obtuse to acute; lateral sepals lanceolate, falcate, 4.5–5.5 × 1.5–1.8 mm, apex acute to obtuse; petals linear, falcate, 4–5 × 0.8–1 mm; lip cuneate, apex dilated and shallowly notched, lateral lobes rounded, with small tooth in sinus, tapering to short, slender claw, with indistinct triangular tooth on either side of base above claw, 8–13 × 5–7 mm, margins minutely bristly-ciliate; column arcuate, slender, 2.5–3.5(–4) × 1 mm, apex slightly expanded. Capsules ellipsoid, 8 × 5 mm, essentially glabrous. 2n = 36.

Phenology: Flowering Jun–Sep.
Habitat: Rich humus in open woods to boggy meadows, soil circumneutral or at most only mildly acid, prefers cool soil, widespread across northern part of continent, extending southward only at high elevations
Elevation: 100–2600 m

Distribution

V26 1204-distribution-map.jpg

St. Pierre and Miquelon, Alta., B.C., N.B., Nfld. and Labr. (Nfld.), N.S., Ont., P.E.I., Que., Alaska (including Aleutian Islands), Ariz., Calif., Colo., Idaho, Maine, Mich., Minn., Mont., Nev., N.H., N.Y., Oreg., S.Dak., Utah, Vt., Wash., Wis., Wyo.

Discussion

Listera convallarioides has a relatively large flower compared to most of the other listeras. It crosses with L. auriculata to produce a natural hybrid L. ×veltmanii Case, which is discussed under 3. L. auriculata.

References

None.

Lower Taxa

No lower taxa listed.