Flora of North America species comparison

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.

(1–)2–3(–4), spreading to ascending, gradually to rather abruptly reduced to bracts distally;

blade lanceolate to elliptic-oblong, 5–35 × 1–7 cm.

dense.

lax to dense.

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.

resupinate, inconspicuous, yellowish green;

lateral sepals porrect to reflexed;

petals oblong-orbiculate to ovate, apex somewhat crenulate;

lip descending to commonly reflexed, 2–6 × 1.8–5 mm, base auriculate, with prominent central tubercle, distal margin entire to slightly crenulate;

spur cylindric to strongly clavate, 4–8(–11) mm, apex rarely 2-lobed;

rostellum lobes mostly parallel to slightly diverging, directed downward, minute, obscure;

pollinia remaining enclosed in anther sacs;

viscidia mostly quadrangular, oblong-quadrangular, orbiculate, or broadly asymmetric, commonly canaliculate to nearly cylindric and difficult to assess;

ovary rather slender to stout, mostly 8–10 × 2 mm.