Listera australis

Lindley
Gen. Sp. Orchid. Pl., 456. 1840.
Common names: Southern twayblade
Endemic
Synonyms: Bifolium australe (Lindley) Nieuwland Diphryllum australe Kuntze Neottia australis (Lindley) Szlachetko Ophrys australis (Lindley) House
Treatment appears in FNA Volume 26. Treatment on page 587.

Plants 8–29 cm. Stems purplish green, succulent, glabrous. Leaves: blade dark green, ovate, ovate-oblong, or elliptic, 1.3–4 × 0.5–2.1 cm, base often subcordate, apex obtuse to apiculate. Inflorescences 5–25-flowered, lax, 45–110 mm; floral bracts suborbiculate-ovate, 2 × 1 mm, apex obtuse; peduncle and rachis slightly glandular-puberulent; bracts, pedicel, and ovary glabrous. Flowers reddish purple; pedicel filiform, 4–6 mm; dorsal sepal ovate-elliptic, concave, 1.5 × 1 mm, apex obtuse; lateral sepals ovate, falcate, 1.5 × 1 mm, apex obtuse; petals recurved, oblong, 1.5 × 0.5 mm, apex obtuse; lip linear, 6–12 × 1.5–2 mm, base extended into 2 rounded, linear lobes, projecting distally, partially surrounding column, distal half split into 2 linear-lanceolate lobes with minute tooth in sinus; column 0.5–1 × 0.5–1 mm. Capsules horizontal, ovoid, 8 × 5 mm, with relatively few large seeds.


Phenology: Flowering Jan (Fla)–Jul.
Habitat: Rich humus of low moist woods, marshes, sphagnum bogs, usually in association with rhizomes of cinnamon fern (Osmunda cinnamomea) and royal fern (O. regalis)
Elevation: 0–1000 m

Distribution

V26 1198-distribution-map.jpg

N.B., N.S., Ont., Que., Ala., Ark., Fla., Ga., La., Miss., N.J., N.Y., N.C., Okla., Pa., S.C., Tenn., Tex., Vt.

Discussion

Perianth parts of Listera australis persist as capsules mature. This is such a small orchid that it can easily be overlooked; it may have a wider distribution than recorded here.

Selected References

None.

Lower Taxa

None.

... more about "Listera australis"
Lawrence K. Magrath +  and Ronald A. Coleman +
Lindley +
Southern twayblade +
N.B. +, N.S. +, Ont. +, Que. +, Ala. +, Ark. +, Fla. +, Ga. +, La. +, Miss. +, N.J. +, N.Y. +, N.C. +, Okla. +, Pa. +, S.C. +, Tenn. +, Tex. +  and Vt. +
0–1000 m +
Rich humus of low moist woods, marshes, sphagnum bogs, usually in association with rhizomes of cinnamon fern (Osmunda cinnamomea) and royal fern (O. regalis) +
Flowering Jan (Fla)–Jul. +
Gen. Sp. Orchid. Pl., +
Bifolium australe +, Diphryllum australe +, Neottia australis +  and Ophrys australis +
Listera australis +
species +