Flora of North America species comparison

2, in subequal basal pair lying on ground;

bracts (very rarely, 0–)1–6, scattered along stem;

blade broadly elliptic, orbiculate, or oblate, 7–24 × 5–19 cm.

few to several, spreading-ascending on base of stem, gradually reduced to bracts upwards;

blade lanceolate, 9–28 × 1.2–3.5 cm.

lax.

dense to lax.

resupinate, rather showy;

calyx mostly greenish white;

corolla mostly white;

lateral sepals reflexed to somewhat spreading;

petals lanceolate-falcate, margins entire;

lip descending to somewhat reflexed, linear-oblong to linear-lanceolate, without basal thickening, 10–23 × 1–2.5 mm, margins entire;

spur slenderly clavate, 28–46 mm;

rostellum lobes directed strongly forward, wide-spreading, angular;

pollinaria nearly straight, (4.6–)4.7–6.8 mm;

pollinia remaining enclosed in anther sacs;

viscidia orbiculate;

ovary slender to rather stout, mostly 16–29 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.