Parnassia yui Z. P. Jien

Stems 1 or 2(-4), 6-14 cm, usually with 1 leaf near middle. Basal leaves usually 2; petiole slender, 1.5-3 cm; leaf blade abaxially greenish, adaxially deep green, orbicular or broadly ovate-orbicular, 1.2-2.4 × 1.2-2.4 cm, arcuate 7-veined, base deeply cordate, apex rounded-obtuse, distinctly apiculate. Cauline leaf sessile or subsessile, ovate or triangular, very small, 1-4 mm, base truncate or broadly cuneate, often with several rusty brown appendages ca. 1 mm. Flower 0.8-1.3 cm in diam.; hypanthium shortly turbinate. Sepals brown punctate on both surfaces, oblong-lanceolate, ca. 3 × 1.2 mm, 3-veined, margin entire, apex subobtuse, acute, acuminate. Petals white, purple-brown punctate on both surfaces, oblanceolate, 4.5-6 × 1.8-2.5 mm, 1- or 3-veined, base attenuate into a claw 1-1.5 mm, with 2 green, oblong glands, margin fimbriate proximally, apex acute to acuminate. Anthers oblong, 0.5-1 mm; filaments ca. 3 mm; staminodes flat, ca. 2 × 2.4 mm, 3-lobed, central lobe narrower than lateral ones. Ovary ovoid, proximally sunken into hypanthium for ca. 1/4 its length; style 1-1.2 mm; stigma 3-lobed, lobes oblong. Capsule ovoid. Seeds brown, glossy, oblong. Fl. Aug.

NW Yunnan (Gongshan Drung-Nu Zu Zizhixian).

* Beneath bamboos; ca. 3000 m.

Parnassia yui là một loài thực vật có hoa trong họ Dây gối. Loài này được Z.P. Jien mô tả khoa học đầu tiên năm 1963.

俞氏梅花草（学名：Parnassia yui）为卫矛科梅花草属下的一个种。