Herbs, 1-2 m tall. Rhizome nearly creeping, stout, to 2 cm in diam., nodes with sparse broadly ovate scales. Stem erect, reddish brown, base ± ligneous, upper part sparsely shortly rusty tomentose. Panicle composed of terminal and lateral racemes; lateral raceme 5-10 cm, usually 4-7-flowered; peduncle often 2-4 cm; sterile bracts at base of raceme lanceolate, 1-2 cm, glabrous; floral bracts lanceolate or ovate-lanceolate, 1-4 mm, abaxially glabrous; pedicel and ovary often 1-2 cm, ± rusty pubescent. Flowers yellow, ca. 3.5 cm in diam. Sepals narrowly elliptic or suboblong, 2.8-3 × 0.6-0.8 cm, abaxially slightly and very shortly rusty tomentose, apex obtuse. Petals similar to sepals, glabrous; lip obovate, ca. 2 × 1.2 cm, adaxially with many thick longitudinal veins, basal part concave, unlobed, margin incurved and irregularly incised and ± undulate; veins irregularly lamellate or crenate, mostly on distal part. Column 8-10 mm. Fl. May-Jul.
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