Herb, perennial, overwintering by a resting bud; bud ovoid. Leaves shortly petiolate; leaf blade pale green, elliptic-oblong to lanceolate-oblong, 1.5-4.5 cm long, 0.8-2 cm wide, abaxially glabrous, secondary veins 5-7 on each side of midvein, base broadly cuneate, margin involute, apex obtuse to rounded. Flowers 2-6, from generative rosette. Pedicel 4-12 cm long, glabrous, apical part enlarged in fruit. Calyx parted from base into 2 lips, glabrous; lower lip 2-lobed, lobes obovate; upper lip 3-lobed, lobes triangular-ovate. Corolla mostly white with 1 or more yellow spots on palate; tube shortly funnelform-tubular, outside glabrous, inside puberulous; spur yellowish, cylindric, straight, as long as corolla tube, apex rounded; lobes of lower lip circular to broadly ovate, apex rounded to obtuse; lobes of upper lip broadly ovate to suborbicular, apex obtuse. Filaments curved; anther thecae confluent. Ovary globose; style short but distinct; stigma lower lip circular and ciliate, upper lip deltoid. Capsule ovoid-oblong, glabrous. Seeds narrowly ellipsoid; seed coat with small prominent elongate reticulations.
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