7. Parnassia yanyuanensis T. C. Ku, Bull. Bot. Res., Harbin. 7(1): 26. 1987.
盐源梅花草 yan yuan mei hua cao
Stems 1(or 2), 3-4 cm, with 1 leaf distally or near apex. Basal leaves 4-7; petiole 1.5-2.8 cm; leaf blade abaxially greenish, adaxially deep green, ovate-cordate, 6-11 × 6-9 mm, inconspicuously 3-veined abaxially at base, base cordate, apex obtuse. Cauline leaf very shortly petiolate; leaf blade ovate-lanceolate, ca. 7 × 4 mm, base truncate or subcordate, often with several rusty brown appendages. Flower ca. 1 cm in diam.; hypanthium shortly campanulate. Sepals long elliptic, 2.5-2.8 × ca. 2 mm, base often with 2 or 3 rusty brown appendages, margin entire, apex obtuse. Petals yellowish, inconspicuously purple punctate, obovate-oblong, 4-4.8 × ca. 2 mm, base attenuate into a claw ca. 1 × 0.8 mm, margin entire or indistinctly erose, apex rounded. Anthers oblong, ca. 0.8 mm; filaments 3-4 mm; staminodes terete, discoid, ca. 1.1 × 0.2 mm, shorter than stamens, stalk ca. 0.2 × 0.8 mm, lamina ca. 0.7 × 0.2 mm, apex rounded. Ovary superior, ovoid; stigma 3-lobed. Capsule unknown. Fl. Jul.
* Rock fissures on mountain slopes; ca. 4000 m. SW Sichuan (Yanyuan Xian).
In habit, this species resembles both Parnassia angustipetala and P. yulongshanensis. However, the former species differs in having sepals oblong or ovate-lanceolate, and petals green, densely purple-brown punctate, spatulate or ovate-lanceolate. The latter species differs in having green petals and apically truncate or emarginate staminodes.