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Plants with partly aerial pseudobulbs joined at the base; leaves thin-tissued, with a noticeable abscission layer, reaching 750 x 110 mm, with several progressively shorter leaves below; flowering stem 0.4-2.3 m tall. Inflorescences lax and elongate, 4-35-flowered. Flowers: sepals green, variously mottled with dark purplish brown, petals bright lemon-yellow, paler on the inner surface, lip midlobe yellow, side lobes dull purple, crests deep yellow. Sepals and petals widely spreading, subequal; median sepal (9.7-) 11-18 (-21) mm, narrowly obovate, mucronate; petals as long as the median sepal, rotund. Lip 3-lobed, rather convex between the bases of the side lobes, crests consisting of low subconfluent ridges on the central veins; side lobes fused more to mentum than lip; mentum broad, the same length as the gynostemium; spur stout, subcylindrical, 1.5-2.2 mm long. Gynostemium 5-9 mm long.
Terrestrial, robust herb, with aerial pseudobulbs, 0.4-2.3 m high. Leaves erect, plicate, glabrous, 750 x 110 mm, partially to fully developed at anthesis. Inflorescence lax and elongate, 10-40-flowered. Flowers with sepals green, variously mottled with dark purplish brown, petals bright lemon-yellow, paler on inner surface, lip midlobe yellow, side lobes dark purple, crests deep yellow. Sepals: median sepal 11-18 mm long, narrowly obovate, mucronate; lateral sepals similar. Petals same size as median sepal, rotund. Lip 3-lobed, convex, crests with low, confluent ridges on central veins, side lobes fused to mentum rather than lip; mentum broad, 5-9 mm long, spur stout. Gynostemium 5-9 mm long. Flowering time Oct.-Jan.
Geophyte to 2 m, with partly exposed pseudobulbs. Leaves lanceolate, pleated. Flowers few to many in a lax, elongate raceme, sepals green mottled with brown, petals and lip midlobe yellow, lip side lobes purple, median sepal 11-18 mm long, lip crests of low ridges, spur subcylindrical, 1.5-2.2 mm long.
Terrestrial herb, up to 2.3 m high. Leaves with a transverse line near base marking an abscission layer. Margin of side lobe of lip adjoining midlobe 5-9 mm long. Flowers with sepals green, mottled dark purplish brown, petals bright lemon-yellow, side lobes of lip dull purple, midlobe yellow.
Lip (8)15–20 mm long, 3-lobed; side lobes 6.5–7 × 4.5–6.5 mm, erect, quite free from the column; mid-lobe 7.5–12 × 7.5–11 mm, the margins folded down, with a crest of 3–5 fleshy ridges down the centre; spur 2–4 mm long, conical, pointing backwards.
Sepals green or yellow-green blotched with brownish-purple, particularly inside; petals bright yellow outside, creamy-yellow inside; lip yellow, the side lobes purple, spur purple-red.
Perennating organs pseudobulbous, mostly above ground, 2.5–10 cm tall, up to 2.5 cm in diameter, conical to cylindrical, ribbed, clustered.
Sepals (8)15–18 × (3)6–10 mm, oblanceolate or obovate, apiculate, the laterals slightly longer than the dorsal.
Leaves several, forming a fan, blade 40–65 × 0.5–8 cm, lanceolate, acute or acuminate, plicate.
Inflorescences rather laxly many-flowered; scape stout with several sheaths along its length.
Petals (8)13–21 × (8)12.5–20 mm, orbicular or ovate, lying parallel to the column.
Pedicel and ovary 15–25 mm long, arched so that the flowers face down.
Bracts 7–20 mm long, lanceolate or ovate, acute or acuminate.
Column 5–9 mm long, with a foot about 6 mm long.
Roots 4–6 mm in diameter, fleshy, white.
Robust terrestrial herb 50–150 cm tall.
