Robust, perennial herb, 15-40 cm, the underground parts not scaly; plants strigulose, stems pubescent all around. Leaves mostly opposite, alternate in and near the inflorescence, the upper ones reduced, strigulose along the veins and margins especially below, the nerves evident, ovate, 1-3 by 0.4-1.5 cm, serrate; petiole 1-2 mm. Inflorescence slightly nodding. Flowers erect, borne in the axils of reduced upper leaves. Floral tube 1.8-2.4 mm across, 1-1.3 mm deep. Sepals 2.5-5.5 by 1-1.3 mm. Petals obovate, 4.5-8 by 3-5.5 mm, rose purple, the notch 1-1.5 mm deep. Anthers 1-1.2 mm long; filaments of the longer stamens 1.2-2.5 mm, those of the shorter 1—1.5 mm. Style 2.5-4 mm. Stigma clavate, 1.8-2.3 mm high, c. 1 mm thick, surrounded by the anthers at anthesis. Capsule 3.5-7 cm long, on a pedicel 0-1 cm. Seeds 0.9-1.2 by 0.4-0.5 mm, papillose, blackish brown, not beaked, obovoid, blunt at both ends, the coma 5-7 mm long, white. Gametic chromosome number, n = 18.
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Stems 15-90 cm tall, simple to well-branched above. Leaves subleathery; petiole to 4 mm; cauline blade lanceolate or elliptic to narrowly ovate, 1.5-5(-8) × 0.5-2(-3) cm, base rounded or cuneate, margin sharply denticulate with 7-17 teeth per side, apex subobtuse to acute. Petals 7-10 mm. Stigma clavate. Capsules 3.5-7 cm. Seeds 1-1.1 mm. Fl. Jul-Sep(-Oct), fr. Sep-Oct. 2n = 36*.
Wet open slopes in the pine region, along streams and by springs, 1400-2100 m. Fl. July, Oct.
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