Platanthera blephariglottis
Platanthera limosa
white fringe orchid, white-fringe bog-orchid
Thurber's bog orchid
2–several, spreading to ascending, scattered along stem, rather abruptly to gradually reduced distally;
blade linear-lanceolate, ovate-lanceolate, elliptic-lanceolate, 5–35 × 1–5 cm.
few to several, spreading-ascending on base of stem, gradually reduced to bracts upwards;
blade lanceolate, 9–28 × 1.2–3.5 cm.
dense to rather lax.
dense to lax.
resupinate, showy, white;
lateral sepals reflexed;
petals linear to oblanceolate, apex fringed to nearly entire;
lip reflexed to porrect, without basal thickening, ovate-oblong to oblong-elliptic, rarely quadrangular-suborbiculate, margin fringed;
spur essentially cylindric, slender;
rostellum lobes curving forward, slightly spreading, angular-elongate;
pollinaria with stalks curved forward;
pollinia remaining enclosed in anther sacs;
viscidia elliptic-suborbiculate to orbiculate;
ovary slender, 10–28 mm.
resupinate, inconspicuous, green;
lateral sepals reflexed to spreading;
petals lanceolate-, ovate-oblong-, or ovate-falcate, margins entire;
lip descending to reflexed, linear-oblong, linear-elliptic, or rhombic-ovate, usually with inconspicuous to scarcely discernable (possibly sometimes absent) median basal thickening, 2.5–8.5 × less than 1–3.5 mm, margins entire;
spur filiform, tapering toward apex, very rarely filiform-conic from slightly stout base, 8–25 mm;
rostellum lobes mostly parallel, closely spaced, directed downward, very small, rounded, obscure;
pollinaria straight;
pollinia remaining enclosed in anther sacs;
viscidia evidently elliptic-oblong;
ovary rather slender to stout, mostly 4.5–11 mm.
Platanthera blephariglottis
Platanthera limosa
Varieties 2 (2 in the flora).
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Platanthera limosa is traditionally distinguished from other slender-spurred plants and from P. sparsiflora by the presence on the lip of a median thickening that culminates in a small basal process. Although diagnostic when present, this feature is often obscure, especially in live material, and seems to be lacking in some plants. Platanthera limosa is most consistently separated from other green-flowered species by the combination of very small, narrow column and slender spur much longer than the lip. These features are in contrast to the very large, broad columns of P. sparsiflora and P. zothecina and much shorter spurs of the P. hyperborea complex. The lips of most plants are elliptic to elliptic-oblong, unlike any other species except the Aleutian P. tipuloides, and such plants are readily determined by lip shape and spur characters. Within populations plants may vary greatly in flower size, spur shape and length, and the ratio of spur to lip length. Individual plants may vary markedly in size of the flowers and density of the inflorescence in different years. That situation warrants additional study, as it may obscure the presence of other taxa.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
1. Spur less than 26 mm, to 1.25 times length of ovary. | var. blephariglottis |
1. Spur at least 30 mm, commonly about 2 times length of ovary. | var. conspicua |
WildflowerSearch
iNaturalist
USDA Plants Database
