Platanthera leucophaea

(Nuttall) Lindley

Gen. Sp. Orchid. Pl., 294. 1835.

IllustratedEndemicConservation concern
Basionym: Orchis leucophaea Nuttall Trans. Amer. Philos. Soc., n. s. 5: 161. 1834
Synonyms: Habenaria leucophaea (Nuttall) A. Gray
Treatment appears in FNA Volume 26. Treatment on page 566. Mentioned on page 552, 564, 565.

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.


Phenology: Flowering Jun–Aug.
Habitat: Mesic to wet prairies, marshes, fens, lake shores, old fields
Elevation: 80–300 m

Distribution

V26 1155-distribution-map.jpg

Ont., Ill., Ind., Iowa, La., Maine, Mich., Mo., Nebr., N.J., N.Y., Ohio, Okla., Va., Wis.

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.

Selected References

None.

Lower Taxa

None.
... more about "Platanthera leucophaea"
Charles J. Sheviak +
(Nuttall) Lindley +
Orchis leucophaea +
Ont. +, Ill. +, Ind. +, Iowa +, La. +, Maine +, Mich. +, Mo. +, Nebr. +, N.J. +, N.Y. +, Ohio +, Okla. +, Va. +  and Wis. +
80–300 m +
Mesic to wet prairies, marshes, fens, lake shores, old fields +
Flowering Jun–Aug. +
Gen. Sp. Orchid. Pl., +
Illustrated +, Endemic +  and Conservation concern +
Habenaria leucophaea +
Platanthera leucophaea +
Platanthera +
species +