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.

1–3, ascending to spreading, abruptly or gradually reduced to bracts distally, often fugaceous and withered at anthesis;

blade linear to linear-lanceolate, 3–31 × 0.3–2 cm.

lax.

dense.

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.

not resupinate, showy, white;

lateral sepals spreading;

petals linear-oblong to oblong or elliptic, falcate, basally somewhat dilated, margins entire;

lip reflexed ± at middle, linear-elliptic to linear-oblong, without basal thickening, 3–8 × 1–3 mm, margins entire;

spur slenderly cylindric, 10–18 mm;

rostellum lobes directed downward, very short, obscure, rounded;

pollinaria straight, pollinia remaining enclosed in anther sacs;

viscidia oblong to linear-oblong;

ovary slender, 4–12 mm.