Gen. Sp. Orchid. Pl., 534. 1840.
Stem ± strongly thickened, base not bulbous. Inflorescences: racemes lax to dense, 10–67 × 1.2–4.5 cm. Flowers 2–35, chasmogamous, conspicuous to showy; perianth open and spreading to connivent; sepals and petals salmon reddish purple with darker veins or pure yellow, lanceolate to oblanceolate, 3–5-veined; lip obovate, unlobed, 3.2–16.5 × 2–6.2 mm, thickened, margins deep red with white or yellow at base, or pure yellow, upturned, giving boatshaped appearance especially toward apex; callus formed by partial connation of 2 basal lamellae, less than 1/3 length of lip; column pure yellow or yellow spotted with red, curved toward lip, 3–6 mm, base without auricles or ridges; ovary 3–8.5 mm; mentum absent. Capsules ellipsoid, 11–30 × 5–10 mm.
North America, Mexico
Varieties 3 (2 in the flora).