• Scientific Name: Ranunculus petrogeiton Ulbr.
• Ref: Repert. Spec. Nov. Regni Veg. Beih. 12:376. 1922
• Chinese Common Name: 太白山毛茛 Tàibái shān∙máogèn
• Family: Ranunculaceae
• Genus: Ranunculus
• Distribution: Forests, gravelly slopes; 3000–4800 m. C Gansu, S Shaanxi (Taibai Shan), W Sichuan (Kangding Xian, Sungpan Xian).
• Photo: 07/21/2011, Mt. Taibai, Qinling

Herbs perennial. Roots fibrous, subequally thick. Stems ascending, 5--12(--20) cm, sparsely puberulent, branched or simple. Basal leaves 3 or more; petiole 0.7--5.5 cm, glabrous or sparsely puberulent; blade 3-sect or 3-partite, pentagonal or broadly ovate, 0.5--2 × 0.7--2.2 cm, thinly leathery or papery, glabrous or abaxially sparsely puberulent, base cordate, central segment cuneate or rhombic, 3-lobed, 3-dentate, or entire; lateral segments obliquely flabellate, unequally 2-lobed. Lower stem leaves similar to basal ones, short petiolate, upper ones subsessile, 3-sect, segments oblong. Flowers solitary, terminal, 0.9--2 cm. Receptacle glabrous. Sepals 5, elliptic, 4--6.5 mm, abaxially sparsely puberulent. Petals 5(or 6), obovate or oblong-obovate, rarely broadly obovate, 4.5--9 × 2--9 mm, nectary pit without a scale, apex rounded, rarely subtruncate. Stamens numerous; anthers oblong. Aggregate fruit ovoid, 5--7 × 4--6 mm; carpels numerous. Achene slightly bilaterally compressed, broadly obovoid, 1.2--1.5 × ca. 1.2 mm, glabrous; style persistent, 0.5--1 mm. Fl. Jul--Aug, fr. Jul--Sep. (Flora of China)