Platanthera obtusata
Platanthera ciliaris
blunt-leaf bog-orchid, blunt-leaf rein-orchid, blunt-leafed rein orchid, bluntleaf orchid, northern small bog orchid, one-leaf rein-orchid, small northern bog-orchid
orange fringe bog-orchid, yellow fringe orchid
1(–2, rarely), spreading-ascending on base of stem;
bracts 0(–1, rarely);
blade linear-oblanceolate, elliptic, or broadly obovate, 3.5–15 × 0.8–5 cm.
2–4, spreading to ascending, gradually to somewhat abruptly reduced to bracts distally;
blade lanceolate to lance-elliptic, 5–40 × 0.6–6 cm.
lax.
rather dense.
resupinate, not showy, greenish white to yellowish green;
corolla commonly whiter than calyx;
lateral sepals reflexed;
petals rhombic, lanceolate-falcate, margins entire;
lip descending, linear, narrowly lance-rhombic, or linear-hastate, with median basal thickening, unlobed, 2.5–8(–10) × less than 1–2 mm, margins entire;
spur slenderly conic, 3–8(–10) mm;
rostellum lobes directed forward, wide-spreading, rounded-angular;
pollinaria straight;
pollinia remaining enclosed in anther sacs;
viscidia orbiculate;
ovary rather slender to stout, mostly 3–10 mm.
resupinate, showy, orange;
dorsal sepal entire or rarely emarginate;
lateral sepals reflexed;
petals linear to linear-cuneate, margins apically fringed;
lip porrect to descending, oblong to broadly ovate-spatulate, without basal thickening, 8–19 × 4–18 mm, margins deeply filiform-fringed;
spur slenderly cylindric, rarely slightly clavate, 20–35 mm;
rostellum lobes scarcely to markedly curving forward, slightly spreading, angular-elongate;
pollinaria with stalks nearly straight to curved forward;
pollinia remaining enclosed in anther sacs;
viscidia orbiculate;
ovary slender, 12–27 mm.
= 42, 63 (American, as Habenaria obtusata), 126 (Eurasian, as Habenaria obtusata).
Platanthera obtusata
Platanthera ciliaris
The rare Eurasian Platanthera obtusata subsp. oligantha (Turczaninow) Hultén differs from the North American subsp. obtusata in its smaller dimensions and rhombic-lanceolate lip. It is also said to be densely few-flowered, although some Siberian material is comparable to American plants. Supposedly intermediate plants are reported from Alaska, and much material from that area is reduced in stature and with smaller flowers than typical of American plants. In most cases, however, lips are relatively slender, and the plants seem merely to be stunted by their environment. One or two collections from the Alaskan Peninsula and Aleutians, however, seem entirely referable to subsp. oligantha with dense, few-flowered inflorescences of very small flowers with rhombic-lanceolate lips and shorter curved spurs. Eurasian plants are reported to be hexaploid or perhaps sometimes triploid, and if the apparent ploidy differences delimit the taxa, then it should be possible to unequivocally identify Alaskan plants.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Selection for longer spurs in response to local pollination pressures on the southeastern Coastal Plain has been documented in Platanthera ciliaris, but the extent of variation is minimal, and the situation does not appear to be comparable to that in P. blephariglottis.
Hybrids of Platanthera ciliaris with P. blephariglottis are P. ×bicolor (Rafinesque) Luer and with P. cristata are P. ×channellii Folsom; until recently the latter was confused with P. chapmanii (J. P. Folsom 1984).
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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