Rootstock producing a tuber. Tuber ±80 mm diam., ± depressed, 0-70 mm below ground, producing one or more annual stems. Stems branching from near base and appearing tufted, 15-50 mm high, puberulous. Leaves spreading, tapering into a short petiole or rounded at base, oblong-lanceolate, 7-30 mm long, up to 7 mm broad, with margins folded upwards, ± undulate, puberulous below, glabrous above. Flowers in 10-20.flowered umbellate cymes, the last terminal; pedicels 3-8 mm long, puberulous. Sepals narrowly lanceolate, 2-4 mm long. Corolla 10-12 mm long, divided to more than halfway; tube 4-6 mm long, 3-3.5 mm diam., obtusely 5-angled, slightly narrowed towards mouth, outside minutely puberulous or papillate on upper part, maculate with dark purple, glabrous within, yellow and purple punctate; lobes 6-7 mm long, free at tips, connivent at first, becoming slightly spreading, obovate-oblong, ±2 mm broad, auriculate at base, inflexed, acute at apex, margins replicate, minutely puberulous outside, glabrous, verrucose and blackish on inner surface. Corona campanulate at base outer lobes forming 5 pockets with outer margin extending into lobules behind base of inner lobes, the apparent bifid outer lobes thus being extensions of the margin of adjacent outer lobes; inner lobes arising from within base of outer corona, linear, obtuse, 2 mm long, incumbent-erect, much overtopping staminal column, tips obtuse, connivent, minutely papillate. Pollinia globose-pyriform, ±0.25 mm long, with short delicate caudicles and small carriers.
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Perennial herb, 15-50 mm tall. Few-to many-flowered fascicles of flowers opening together. Corolla 10-12 mm long, glabrous, divided to slightly more than halfway; lobes obovate-oblong, replicate, inflexed, acute at apex. Flowers dark purple outside, yellow and purple inside, lobes blackish inside.