Impatiens cyclosepala Hook. fil. ex W. W. Smith

Plants annual, 30-60 cm tall. Stem erect, yellow-brown puberulent in upper part when young, hairs ± deciduous later, subglabrous, long naked in lower part, nodes turgid, sulcate when dry, glabrous, laxly branched. Leaves alternate; petiole 1-2.5 cm; leaf blade gray-green abaxially, dark green adaxially, ovate or ovate-lanceolate, (6-)7-11 × 2.5-4.5 cm, papery, abaxial midvein sparsely pilose or glabrate, adaxially strigose, lateral veins 5-7 pairs, curved, base broadly cuneate, attenuate into petiole, margin crenate-serrate, teeth glandular-mucronulate, apex long acuminate. Inflorescences in leaf axils in upper part of stem and branches, 3-5-flowered; peduncles erect or ascending, shorter than leaves, 3-5 cm. Pedicels 1-2 cm, bracteate at base; bracts persistent, green, broadly ovate, ca. 3 mm, thick, apex cuspidate. Flowers yellowish, purplish striate, 2.5-3 cm deep. Lateral sepals 2, orbicular, 0.8-1 cm in diam., membranous, reticulate veined, apex glandular mucronulate. Lower sepal broadly saccate, ca. 2 cm deep, abruptly constricted into an incurved spur 4-5 mm; mouth oblique, ca. 1.4 cm, tip acute. Upper petal suborbicular, ca. 1.5 cm in diam., abaxial midvein thickened, with horn-shaped crista at middle; lateral united petals not clawed, ca. 2.5 cm, 2-lobed; basal lobes suborbicular, ca. 1 cm wide; distal lobes broadly ovate, longer, apex obtuse. Filaments linear, 4-5 mm; anthers acute. Ovary linear. Capsule not seen. Fl. Jul-Aug.

NW Yunnan.

● By streams, moist places in limestone valleys; ca. 2600 m.

Impatiens cyclosepala adalah spesies tumbuhan yang tergolong ke dalam famili Balsaminaceae. Spesies ini juga merupakan bagian dari ordo Ericales. Spesies Impatiens cyclosepala sendiri merupakan bagian dari genus Impatiens. Nama ilmiah dari spesies ini pertama kali diterbitkan oleh Hook.f. ex W.W.Sm..

Impatiens cyclosepala là một loài thực vật có hoa trong họ Bóng nước. Loài này được Hook. f. ex W.W. Sm. mô tả khoa học đầu tiên năm 1915.

环萼凤仙花（学名：Impatiens cyclosepala）为凤仙花科凤仙花属下的一个种。