UW Burke Herbarium species comparison

Leaves usually 1, rarely 2, basal, in addition to 1 or 2 sheathing bracts, the blade elliptic-oblanceolate to oblong-oblanceolate, 3-10 cm. long and 1/3 to 1/4 as broad, rounded, gradually tapered to a winged petiole 1/4 as long to nearly as long as the blade.

Leaves alternate, several, mostly on the lower half of the stem, sheathing, narrowly oblong-elliptic, 6-20 cm. long and 1-3 cm. broad, blunt to acute.

Inflorescence a 3- to 15-flowered raceme, the pedicles 1-5 mm. long, the floral bracts green and up to 15 mm. long on the lower part to yellowish and 2 mm. long above;

flowers pale greenish or yellowish-green, the petals sometimes whitish; upper sepal sub-orbicular, 3-4 mm. long, erect; lower sepals obliquely triangular-ovate, 4-6 mm. long, somewhat reflexed;

petals about equal to the upper sepal, broadly lanceolate;

lip narrowly strap-shaped, about 1.5 mm. broad and 5-9 mm. long, pendant, but with an upturned tip, and 2 small, oblong growths near the base;

spur tapered from the base, curved, 5-8 mm. long;

stamens and style fused to form a column 2-3.5 mm. long with lateral growths projecting upward.

Inflorescence a densely-flowered, spike-like raceme 5-15 cm. long, the lower bracts 2-3 times as long as the flowers, the upper shorter than them;

flowers pale to deep green, often purple tinged or veined; upper sepal ovate-elliptic to sub-orbicular, rounded, 4-7 mm. long, 3-nerved, forming a distinct hood; lower sepals 3-nerved, spreading, ovate-lanceolate, 4-7 mm. long;

petals about equal to the sepals;

lip narrowly lanceolate, fleshy, 4-7 mm. long;

spur cylindric, usually somewhat curved, from much shorter to barely longer than the lip;

stamens and style fused to form a column about half as long as the upper sepal.