Flora of North America species comparison

3–4, along middle portion of stem, spiraled to alternate, ascending to spreading;

blade narrowly elliptic to ovate-lanceolate or oblong, 5–11 × 1.3–3.5 cm.

3–7, along length of stem, alternate, ascending to spreading;

blade elliptic to elliptic-lanceolate or ovate-lanceolate, 5–19 × 1.5–6 cm.

usually solitary (rarely 2 in forma biflorum P.

1(–2);

sepals white or green;

dorsal sepal suborbiculate to obovate-orbiculate, rarely elliptic, 11–20 × (7–)9–15 mm;

lateral sepals connate to nearly distinct, 6–12 mm, segments 3–6 mm wide;

synsepal 6–15 mm wide;

petals spreading, white, oblong to linear-elliptic, flat, 12–20 × 3–6 mm;

lip white, rarely pinkish, obovoid, 11–20 mm;

orifice basal but often proportionally very large, 9–13 mm;

staminode cordiform-ovoid to ovoid-oblong. 2n = 20.

.

);

sepals green with reddish brown markings;

dorsal sepal broadly elliptic to ovate-lanceolate, 15–25 × 5–10 mm;

lateral sepals distinct, 12–20 × 1.5–4 mm;

petals somewhat spreading, same color as sepals, somewhat spirally twisted, linear- to linear-lanceolate, 11–24 × 1–2 mm;

lip white with green apex, usually with extensive reddish reticulations often merging toward apex, adaxially swollen near middle, 10–16 mm, apex abruptly deflected downward, orifice basal, 7–12 mm;

staminode suborbicular.

= 20.