33. Listera R. Brown, Hortus Kew. 5: 201. 1813.
[For Martin Lister (1638–1711), noted English physician and naturalist]
Lawrence K. Magrath & Ronald A. Coleman
Herbs, perennial, terrestrial. Roots slender, fibrous. Stems slender to stout, glabrous proximal to leaves; cauline bracts 2(–3), enclosing base of stem. Leaves 2(–3, rarely), at apex of stem, opposite or subopposite, sessile, glabrous. Inflorescences terminal, 2–100-flowered racemes; peduncle and rachis densely glandular-pubescent or glabrate; floral bracts inconspicuous, lanceolate, elliptic, suborbiculate-ovate, rhombic-ovate, or oblong. Flowers resupinate, maroon-purple, yellowish green to dark green, blue-green, or pinkish tan; dorsal sepal ovate-elliptic, elliptic-obovate, linear-elliptic, or lanceolate; lateral sepals semiorbiculate-elliptic, ovate, linear-elliptic, or oblong-lanceolate, often falcate-recurved; petals reflexed, spreading, or connivent, linear, linear-oblong to lanceolate, or elliptic, falcate; lip prominently deflexed or not, sessile or clawed, linear-oblong to obovate, suborbiculate-ovate, or ovate-reniform, base of lip with or without prominent auricles or lobes, apex deeply 2-lobed, dilated to rounded, apiculate; calli various, papillose, pair of horns, or with 1–2 lamellae; column arcuate, thick, short, apex expanded or not; anther on adaxial side of column near apex; pollinia 2, yellow, soft; ovaries pedicellate. Fruits capsules, horizontal to semierect, ellipsoid, ovoid, or subglobose, glabrous or glabrate to glandular-pubescent.
Species 25 (8 in the flora): cool temperate regions, Northern and Southern hemispheres.