Listera caurina

Piper

Erythea 6: 32. 1898.

Common names: Northwest twayblade
Endemic
Synonyms: Listera retusa Suksdorf Neottia caurina (Piper) Szlachetko Ophrys caurina (Piper) Rydberg
Treatment appears in FNA Volume 26. Treatment on page 591. Mentioned on page 587.

Plants 5–30 cm. Stems green, succulent, glabrous. Leaves: blade green, ovate to elliptic, 2.5–7 × 1.8–4.5 cm, apex rounded to obtuse or subacute. Inflorescences 5–30-flowered, lax, 50–130 mm; floral bracts rhombic-ovate to lanceolate, apex acute to acuminate, glabrous to slightly glandular; peduncle and rachis glandular-pubescent. Flowers yellowish green, small; pedicel filiform, 4–12 mm, glandular-puberulent; sepals and petals distinct and free, spreading, only slightly reflexed; dorsal sepal linear-lanceolate to lanceolate, 2.8–4 × 0.5–0.8 mm, apex acute to acuminate; lateral sepals linear-lanceolate to lanceolate, falcate, 2.8–4 × 0.5–0.8 mm, apex acute to acuminate; petals linear to linear-lanceolate, slightly falcate, 2.8–3.5 × 0.5–0.8 mm, apex acute to acuminate; lip sessile, cuneate to obovate, 4.5–6 × 2–4.5 mm, apex rounded to retuse, apiculate, apical margin slightly erose or crenulate; disc with pair of dark green stripes, each swollen at base and with small horn 1 mm from top of each swelling; column short, 1.5–2 × 1 mm. Capsules semierect, ovoid to subglobose, 5 × 4 mm, glabrous. 2n = 34.


Phenology: Flowering late Apr–Sep.
Habitat: Dry litter of mixed and coniferous forests, dense moist, coniferous forests, and on boggy wooded slopes, also damp to wet conditions on moss-covered rocks or in mossy soil
Elevation: 100–2200 m

Distribution

V26 1206-distribution-map.jpg

Alta., B.C., Alaska, Calif., Idaho, Mont., Oreg., Wash.

Discussion

Selected References

None.

Lower Taxa

None.
... more about "Listera caurina"
Lawrence K. Magrath +  and Ronald A. Coleman +
Northwest twayblade +
Alta. +, B.C. +, Alaska +, Calif. +, Idaho +, Mont. +, Oreg. +  and Wash. +
100–2200 m +
Dry litter of mixed and coniferous forests, dense moist, coniferous forests, and on boggy wooded slopes, also damp to wet conditions on moss-covered rocks or in mossy soil +
Flowering late Apr–Sep. +
Listera retusa +, Neottia caurina +  and Ophrys caurina +
Listera caurina +
species +