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 ovatelanceolate, 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.

"broad" is not a number.

... more about "Platanthera leucophaea"
self-pollination +
Charles J. Sheviak +
(Nuttall) Lindley +
Orchis leucophaea +
indehiscent +
not +  and articulate +
conduplicate +  and plicate +
0 cm0 mm <br />0 m <br /> (20 cm200 mm <br />0.2 m <br />) +
lanceolate +  and ovatelanceolate +
0cm;4cm +
green +  and whitish green +
1.4 cm14 mm <br />0.014 m <br /> (2.2 cm22 mm <br />0.022 m <br />) +
15mm +  and 29mm +
Ont. +, Ill. +, Ind. +, Iowa +, La. +, Maine +, Mich. +, Mo. +, Nebr. +, N.J. +, N.Y. +, Ohio +, Okla. +, Va. +  and Wis. +
80–300 m +
3-merous +, sessile +  and pedicellate +
ellipsoid;cylindric +
Mesic to wet prairies, marshes, fens, lake shores, old fields +
lateral +  and terminal +
petiolate +, sessile +  and simple +
Several (?) +  and Many (?) +
reduced +
descending +  and horizontally projecting +
fringed +  and 3-lobed +
larger +
entire +  and fringed +
differing in form and color +
slender +
1.5 cm15 mm <br />0.015 m <br /> (3 cm30 mm <br />0.03 m <br />) +
1-many-flowered +  and cymose +
pendent +  and erect +
Flowering Jun–Aug. +
Gen. Sp. Orchid. Pl., +
aerial +  and subterranean +
lancefusiform +
slender +
downward +  and directed +
minute +
free +, distinct +, adnate +  and connate +
foliaceous +
not +  and alike +
Illustrated +, Endemic +  and Conservation concern +
clavate +
2.8 cm28 mm <br />0.028 m <br /> (4.7 cm47 mm <br />0.047 m <br />) +
leafless +  and leafy +
pendent +  and erect +
proliferous +
thickened +  and stout +
concave +  and convex +
Habenaria leucophaea +
Platanthera leucophaea +
Platanthera +
species +
orbiculate +
aquatic +, lithophytic +, terrestrial +  and epiphytic +
saprophytic +, photosynthetic +  and mycotrophic +
erect to somewhat +