Flora of North America species comparison

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Listera caurina

northwest twayblade, northwestern twayblade
Habit 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.

Listera caurina
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 (300–7200 ft)
Distribution
from FNA
AK; CA; ID; MT; OR; WA; AB; BC
[WildflowerSearch map]
Source FNA vol. 26, p. 591.
Parent taxa Orchidaceae > subfam. Epidendroideae > tribe Neottieae > subtribe Limodorinae > Listera
Sibling taxa
L. auriculata, L. australis, L. borealis, L. convallarioides, L. cordata, L. ovata, L. smallii
Synonyms L. retusa, Neottia caurina, Ophrys caurina
Name authority Piper: Erythea 6: 32. (1898)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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(If the plant you're looking for doesn't show up in the auto-complete list, that means it either isn't described in Flora of North America yet, or it's listed under a synonym. And please note that Flora of North America is still missing several plant families, including Fabaceae, Apiaceae, Boraginaceae, and Polemoniaceae.)

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