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Listera
Family: Orchidaceae
Listera image
Paul Rothrock  
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Lawrence K. Magrath & Ronald A. Coleman in Flora of North America (vol. 26)
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.
Vascular plants of NE US and adjacent Canada
Sep and lateral pet much alike, spreading or reflexed; lip declined or projecting horizontally, in our spp. much longer than the lateral pet, 2-lobed or 2-cleft; column erect, shorter than the pet, the anther borne on its back near the tip; pollinia 2; stem bearing a single pair of broad, opposite, sessile lvs near its middle and a terminal raceme of small, green to purple or red fls; our spp. glabrous below the lvs, ±pubescent above them. 25, N. Hemis.

Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.

©The New York Botanical Garden. All rights reserved. Used by permission.
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Show all taxa
Listera auriculata
Image of Listera auriculata
Listera australis
Image of Listera australis
Listera banksiana
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not available
Listera borealis
Image of Listera borealis
Listera caurina
Image of Listera caurina
Listera convallarioides
Image of Listera convallarioides
Listera cordata
Image of Listera cordata
Listera nephrophylla
Image of Listera nephrophylla
Listera ovata
Image of Listera ovata
Listera reniformis
Image of Listera reniformis
Listera smallii
Image of Listera smallii
Listera x veltmanii
Image of Listera x veltmanii
The National Science Foundation
Developments of SEINet, Symbiota, and associated specimen databases have been supported by National Science Foundation Grants (DBI 9983132, BRC 0237418, DBI 0743827, DBI 0847966)