Flora of North America species comparison

(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.

several to many, ascending, scattered along stem, imperceptibly reduced to bracts distally;

blade lanceolate to ovate-lanceolate, usually to 20 × 4 cm.

lax to dense.

lax to moderately dense.

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.

resupinate, showy, corolla white, calyx green to whitish green;

lateral sepals porrect;

petals obovate to rarely flabellate, apically lacerate;

lip descending to horizontally projecting, deeply 3-lobed, without basal thickening, 14–22 × 15–29 mm, distal margins of lobes deeply incised, fringed, lateral lobes flabellate, usually broad, overlapping middle lobe, middle lobe flabellate, sometimes very broadly, emarginate;

spur slenderly clavate, 28–47 mm;

rostellum lobes nearly parallel, directed downward, short, rounded;

pollinaria geniculate;

pollinia directed forward (column appearing hooded), remaining enclosed in anther sacs;

viscidia orbiculate;

ovary slender, mostly 15–30 mm.

= 42.