Impatiens liupanshuiensis

Description. Perennial herb, 30 - 70 cm tall. Stem erect or procumbent basally, branched, upper part brown pubescent. Leaves alternate, petiolate, petioles 0.3 - 1 cm long. Lamina 5 - 10.5 x 1.7 - 2.8 cm, ovate-lanceolate or lanceolate, apex acuminate, base cuneate, with 1 - 3 pairs of basal glands, margin serrulate, teeth ending in setae, adaxial surface remotely puberulous on veins, abaxial surface glabrous, lateral veins 8 - 10 pairs. Inflorescences axillary, 2 - flowered; peduncles 2 - 4 cm long, pedicels 1.5 - 2 cm long, bracteate above middle; bracts persistent, lanceolate, 2 - 4 mm long, margin denticulate. Flowers yellow, ca. 2 cm deep. Lateral sepals 2, obliquely ovate or ovate, inequilateral, 3 - 5 mm long, 2 - 3 mm wide, remotely denticulate on one or both sides, abaxial mid-vein slightly thickened, green, hyaline both sides, apex acuminate, aristate. Lower sepal funnelform, 0.5 cm deep excluding spur, mouth vertical, 0.5 - 0.9 cm wide, base abruptly contracted into an incurved spur, spur 1 - 1.5 cm long. Dorsal petal orbicular, 8 - 10 mm in diam., recurved at anthesis, abaxial mid-vein carinate, with a curved rostrum towards apex, base truncate, apex retuse. Lateral united petals 2 - lobed, sessile, 13 - 18 mm long, basal lobes oblong, extremely small, 1 - 2 mm wide, distal lobes broadly-dolabriform, 1 - 1.3 cm long, 0.9 - 1 cm wide, apex retuse, base with reddish patches; auricle inflexed, small. Stamens 5, filaments linear, anthers obtuse. Ovary erect, fusiform, 5 - carpellate. Capsule cylindrical, 1.5 - 2 cm long, seeds ellipsoid or ovoid, surface with warty protrusions.