Platanthera leucophaea |
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eastern prairie fringe orchid, eastern prairie white fringe bog-orchid, prairie white fringe orchid |
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Habit | Plants 32–112 cm. |
Leaves | several to many, ascending, scattered along stem, imperceptibly reduced to bracts distally; blade lanceolate to ovate-lanceolate, usually to 20 × 4 cm. |
Spikes | lax to moderately dense. |
Flowers | resupinate, showy, corolla white, calyx green to whitish green; lateral sepals porrect; petals obovate to rarely flabellate, apically lacerate; lip descending to horizontally projecting, deeply 3-lobed, without basal thickening, 14–22 × 15–29 mm, distal margins of lobes deeply incised, fringed, lateral lobes flabellate, usually broad, overlapping middle lobe, middle lobe flabellate, sometimes very broadly, emarginate; spur slenderly clavate, 28–47 mm; rostellum lobes nearly parallel, directed downward, short, rounded; pollinaria geniculate; pollinia directed forward (column appearing hooded), remaining enclosed in anther sacs; viscidia orbiculate; ovary slender, mostly 15–30 mm. |
2n | = 42. |
Platanthera leucophaea |
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Phenology | Flowering Jun–Aug. |
Habitat | Mesic to wet prairies, marshes, fens, lake shores, old fields |
Elevation | 80–300 m (300–1000 ft) |
Distribution |
IA; IL; IN; LA; ME; MI; MO; NE; NJ; NY; OH; OK; VA; WI; ON
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Discussion | Of conservation concern. A very rare hybrid with Platanthera psycodes, known only from Ontario, is P. ×reznicekii Catling, Brownell & G. Allen. See the discussion under 22. Plantanthera praeclara. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 26, p. 566. |
Parent taxa | Orchidaceae > subfam. Orchidoideae > tribe Orchideae > subtribe Orchidinae > Platanthera |
Sibling taxa | |
Synonyms | Orchis leucophaea, Habenaria leucophaea |
Name authority | (Nuttall) Lindley: Gen. Sp. Orchid. Pl., 294. (1835) |
Web links |