plant with large oblong tubers, 2 in. long, and leafy stems about 16 in. high; leaves 6–8, linear-lanceolate, acuminate, about 6 in. long, 1/2 in. broad, not decreasing upwards into bracts; scapes with a few bract-like sheaths; racemes lax, few-flowered; bracts ovate, acuminate, pallid, nearly half as long as the pedicelled ovary; flowers rather large, with green sepals and white petals and lip; dorsal sepal cucullate, acuminate, 5 lin. long; lateral sepals deflexed, obliquely ovate, acute, rather longer than the dorsal; petals 2-partite; upper lobe linear, as long as the dorsal sepal and united to its margins; lower lobe linear-lanceolate, falcate, very acuminate, 1 in. long; lip 3-partite, with linear lobes; side lobes about 1 1/4 in. long; front lobe a third to a half shorter; spur cylindrical, somewhat thickened, about 3/4 in. long, its mouth nearly closed by the presence of a small tooth (Bolus); column apiculate; rostellum large, cucullate, side lobes scarcely half as long as the stigmas; stigmas elongated, free from the lip, somewhat curved at the apex. null