Platanthera grandiflora
Platanthera integra
greater purple fringe bog-orchid, greater purple fringe orchid
yellow fringeless orchid
2–6, wide-spreading and recurved to somewhat ascending, scattered along stem, gradually reduced to bracts distally;
blade lanceolate, elliptic, oblong-elliptic, or oblong-obovate, 13–24 × 2.5–9 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.
lax to rather dense.
dense.
resupinate, showy, lavender- to rose-purple, rarely white;
lateral sepals spreading to somewhat reflexed;
petals ovate, oblong, elliptic-oblong, or oblong-obovate, margins crenate to dentate-lacerate, sometimes nearly entire;
lip descending to somewhat porrect, deeply 3-lobed, without basal thickening, 10–25 × 14–26 mm, distal margins of lobes fringed, usually deeply, lateral lobes sometimes perpendicular to middle lobe, lateral lobes cuneate, often broadly so, middle lobe broadly cuneate-flabellate, often emarginate to 2-fid;
spur clavate, 15–35 mm;
rostellum lobes directed forward, spreading, angular;
pollinaria nearly straight;
pollinia remaining enclosed in anther sacs;
viscidia orbiculate;
ovary slender to stout, 12–25 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.
= 42.
Platanthera grandiflora
Platanthera integra
Platanthera grandiflora is known to hybridize with P. lacera in the northeasternmost portion of its range, where the species bloom simultaneously. The name P. ×keenanii P. M. Brown has recently been proposed for these hybrids, but the complex synonymy of this group dictates that types be checked for possible priority. See the discussion under P. lacera. A few specimens also suggest very rare hybridization with P. psycodes (W. P. Stoutamire 1974).
Rare white-flowered plants may be separated from 23. Platanthera leucophaea by the orientation of the pollinia.
(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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