Platanthera integrilabia
Platanthera integra
monkeyface, white fringeless orchid
yellow fringeless orchid
2(–3), spreading to ascending, on basal portion of stem, abruptly reduced to bracts distally;
blade lanceolate to elliptic, 12–23 × 1–3.2 cm.
1–3, ascending to spreading, rather abruptly or gradually reduced to bracts distally;
blade lance-oblong to linear-lanceolate, 4.5–32 × 1–3 cm.
rather lax.
dense.
resupinate, showy, white;
lateral sepals reflexed;
petals oblong, margins entire;
lip porrect, spatulate to lance-spatulate, without basal thickening, 10–15 × 2.5–4 mm, margins slightly lacerate to subentire;
spur slenderly cylindric, scarcely clavate, 35–60 mm;
rostellum lobes directed forward, spreading, angular;
rostellum lobes slenderly curving forward, slightly spreading, angular-elongate, long;
pollinaria with stalks curved forward;
pollinia remaining enclosed in anther sacs;
viscidia orbiculate;
ovary slender, ca.16–22 mm.
resupinate, showy, pale yellow-orange to pale orange;
dorsal sepal entire or rarely apically dentate;
lateral sepals spreading;
petals elliptic to linear-oblong, margins entire;
lip descending, ovate-elliptic to obovate or oblong, 3–5 × 1.5–4 mm, margins eroded to lacerate or rarely entire, with basal pair of fleshy ridges on adaxial surface;
spur tapering from broad base to slender tube, 5–10 mm;
rostellum lobes curved downward, short, rounded;
pollinaria essentially straight; large pollinia protruding forward;
viscidia orbiculate to suborbiculate;
ovary slender to somewhat stout, 5–11 mm.
Platanthera integrilabia
Platanthera integra
Of conservation concern.
The description of Platanthera integrilabia is based on a limited sample and is likely too restrictive.
Flowers of this species are nocturnally sweet-scented. The vegetative habit is distinctive, with leaves restricted to the base of the stem and a relatively few-flowered inflorescence borne atop a tall bracted scape. In addition to the normal tuberoid, roots often enlarge distally to form bud-bearing tuberoids at a marked distance from the parent stem, giving rise to diffuse clonal colonies.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
As in Platanthera clavellata and P. nivea, the column of P. integra bears two pairs of lateral processes. In P. integra, the distal structures are essentially sessile and cushionlike, as in P. nivea, but the proximal are short, stout, clublike, and bear several stout horns. The tuberoids of P. integra are abruptly swollen into oblong-cylinders, somewhat like those of P. nivea. These three species evidently form a group apart from Platanthera. See note under 30. P. nivea.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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