Saxifraga prattii Engler & Irmscher var. trinervia Engler.

Herbs perennial, cespitose, 4.5-7.5 cm tall. Shoots branched, with leaf rosettes. Flowering stem glabrous proximally, dark brown glandular hairy distally. Rosette leaves spatulate, ca. 5 × 1.7 mm, both surfaces glabrous, margin setose-ciliate, apex acute. Cauline leaves narrowly oblong or ensiform- to spatulate-oblong, 6.6-8.2 × 1.2-1.6 mm, both surfaces glabrous or distal leaves abaxially sparsely brown glandular hairy, margin setose-ciliate on proximal leaves, dark brown glandular ciliate on distal leaves, apex acute, mucronate. Flower solitary or cyme 2-flowered; pedicels 0.7-2.2 cm, dark brown glandular hairy. Sepals erect, then spreading, subovate, 2.4-2.5 × 1.9-2 mm, abaxially sparsely dark brown glandular hairy, adaxially and marginally glabrous, veins 4 or 5, not or partly confluent at apex, apex obtuse or acute. Petals yellow, proximally orange spotted adaxially, suboblong, 5.1-6.9 × 2.3-2.9 mm, obscurely 2-callose near base, 3-5-veined, base clawless, apex obtuse or acute. Stamens ca. 3.6 mm. Ovary subsuperior, 2.5-3 mm; styles ca. 1 mm. Fl. Jul-Aug.

* Alpine rock crevices; 5000-5600 m. W Sichuan (Batang Xian, Litang Xian), C and E Xizang (Amdo Xian, Dêngqên Xian, Xainza Xian).