Platanthera praeclara

Sheviak & M. L. Bowles

Rhodora 88: 278, figs. 1a–d, 2–4. 1986.

IllustratedEndemicConservation concern
Synonyms: Habenaria leucophaea var. praeclara (Sheviak & Bowles) Cronquist
Treatment appears in FNA Volume 26. Treatment on page 566. Mentioned on page 552, 564.

Plants 38–85 cm. Leaves several to many, ascending, scattered along stem, imperceptibly reduced to bracts distally; blade lanceolate to ovatelanceolate, to 26 × 5 cm. Spikes lax. Flowers resupinate, showy, creamy white; lateral sepals somewhat porrect; petals flabellate, truncate, sometimes emarginate, apically lacerate; lip descending, deeply 3-lobed, without basal thickening, 17–32 × 20–39 mm, distal margins of lobes deeply incised and fringed, lateral lobes flabellate, sometimes broadly and overlapping middle lobe, middle lobe flabellate, sometimes very broadly, emarginate; spur slenderly clavate, 36–55 mm; rostellum lobes directed strongly forward, widespreading, angular; pollinaria geniculate; pollinia directed forward (column appearing hooded), remaining enclosed in anther sacs; viscidia orbiculate; ovary slender, mostly 20–30 mm. 2n = 42.


Phenology: Flowering (May–)Jun–Aug.
Habitat: Mesic to wet prairies
Elevation: 200–800(–1600 m)

Distribution

V26 1154-distribution-map.jpg

Man., Iowa, Kans., Minn., Mo., Nebr., N.Dak., Okla., S.Dak., Wyo.

Discussion

Of conservation concern.

In Platanthera praeclara the wide-spreading rostellum lobes separate the viscidia by 6–7.5 mm, whereas in P. leucophaea the short rostellum lobes are more nearly parallel, and the viscidia are separated only by about 1–3.5 mm. These differences are immediately obvious on living material, but the measurements are nearly always impossible in herbarium specimens.

In Wyoming Platanthera praeclara is known from a single, much higher station outside the usual range.

Selected References

None.

Lower Taxa

None.
... more about "Platanthera praeclara"
self-pollination +
Charles J. Sheviak +
Sheviak & M. L. Bowles +
indehiscent +
not +  and articulate +
conduplicate +  and plicate +
0 cm0 mm <br />0 m <br /> (26 cm260 mm <br />0.26 m <br />) +
lanceolate +  and ovatelanceolate +
0cm;5cm +
1.7 cm17 mm <br />0.017 m <br /> (3.2 cm32 mm <br />0.032 m <br />) +
20mm +  and 39mm +
Man. +, Iowa +, Kans. +, Minn. +, Mo. +, Nebr. +, N.Dak. +, Okla. +, S.Dak. +  and Wyo. +
200–800(–1600 m) +
3-merous +, sessile +  and pedicellate +
creamy white +
ellipsoid;cylindric +
Mesic to wet prairies +
lateral +  and terminal +
petiolate +, sessile +  and simple +
Several (?) +  and Many (?) +
reduced +
descending +
fringed +  and 3-lobed +
larger +
entire +  and fringed +
differing in form and color +
slender +
2 cm20 mm <br />0.02 m <br /> (3 cm30 mm <br />0.03 m <br />) +
1-many-flowered +  and cymose +
pendent +  and erect +
Flowering (May–)Jun–Aug. +
aerial +  and subterranean +
lancefusiform +
slender +
widespreading +  and directed +
minute +
free +, distinct +, adnate +  and connate +
foliaceous +
not +  and alike +
Illustrated +, Endemic +  and Conservation concern +
clavate +
3.6 cm36 mm <br />0.036 m <br /> (5.5 cm55 mm <br />0.055 m <br />) +
leafless +  and leafy +
pendent +  and erect +
proliferous +
thickened +  and stout +
concave +  and convex +
Habenaria leucophaea var. praeclara +
Platanthera praeclara +
Platanthera +
species +
orbiculate +
aquatic +, lithophytic +, terrestrial +  and epiphytic +
saprophytic +, photosynthetic +  and mycotrophic +
erect to somewhat +