1. Rosaceae (蔷薇科)
2. Acomastylis (羽叶花属)
3. Acomastylis macrosepala (大萼羽叶花)

Geum macrosepalum Ludlow, Bull. Brit. Mus. (Nat. Hist.), Bot. 5: 271. 1976.

Rootstock stout, terete; lateral roots many. Flowering stems erect or ascending, 30–70 cm tall, pubescent or hirtellous. Radical leaves 10–15 cm including petiole; leaf blade lyrately pinnate, with 5–10 pairs of leaflets, appressed pilose or strigose; terminal leaflet rather large, ovate or reniform, not lobed, 5–6 × 4–7 cm, base deeply cordate, margin irregularly obtusely crenate, apex rounded; lateral leaflets smaller than terminal one; cauline leaves: stipules green, oblong-ovate, herbaceous, margin serrate or subentire; leaf blade simple, obovate or broadly ovate, slightly 5–7-lobed, 10–40 × 5–20 mm. Flower 1(or 2), erect, rarely nodding, 2.5–3.5 cm in diam. Sepals ovate or broadly so, apex acute; epicalyx segments usually purple-brownish yellow, ovate, 1/4–1/3 as long as sepals, abaxially hirsute. Petals yellow, sometimes purple-brown at apex, obovate, nearly equaling sepals, abaxially sparsely pilose, base tapered into a claw, apex emarginate. Style terminal, filiform, not twisted, hirsute but glabrous distally. Achenes long ellipsoid, 5–6 mm when ripe, hirsute; style erect, short, persistent. Fl. and fr. Aug–Sep.

Meadow and thickets on mountain slopes; 3800--4400 m. Xizang [Bhutan, India, Sikkim].